JEE Main
Mathematics
Straight Lines and Pair of Straight Lines
Previous Years Questions

The combined equation of the two lines $$ax+by+c=0$$ and $$a'x+b'y+c'=0$$ can be written as $$(ax+by+c)(a'x+b'y+c')=0$$. The equation of the angle bi...
If the orthocentre of the triangle, whose vertices are (1, 2), (2, 3) and (3, 1) is $$(\alpha,\beta)$$, then the quadratic equation whose roots are $$... Let$$B$$and$$C$$be the two points on the line$$y+x=0$$such that$$B$$and$$C$$are symmetric with respect to the origin. Suppose$$A$$is a poi... A light ray emits from the origin making an angle 30$$^\circ$$with the positive$$x$$-axis. After getting reflected by the line$$x+y=1$$, if this ra... Let$$m_{1}, m_{2}$$be the slopes of two adjacent sides of a square of side a such that$$a^{2}+11 a+3\left(m_{1}^{2}+m_{2}^{2}\right)=220$$. If one ... Let$$\mathrm{A}(\alpha,-2), \mathrm{B}(\alpha, 6)$$and$$\mathrm{C}\left(\frac{\alpha}{4},-2\right)$$be vertices of a$$\triangle \mathrm{ABC}$$. I... Let the circumcentre of a triangle with vertices A(a, 3), B(b, 5) and C(a, b), ab > 0 be P(1,1). If the line AP intersects the line BC at the point Q... The equations of the sides$$\mathrm{AB}, \mathrm{BC}$$and CA of a triangle ABC are$$2 x+y=0, x+\mathrm{p} y=39$$and$$x-y=3$$respectively and$$\...
Let $$A(1,1), B(-4,3), C(-2,-5)$$ be vertices of a triangle $$A B C, P$$ be a point on side $$B C$$, and $$\Delta_{1}$$ and $$\Delta_{2}$$ be the area...
A point $$P$$ moves so that the sum of squares of its distances from the points $$(1,2)$$ and $$(-2,1)$$ is 14. Let $$f(x, y)=0$$ be the locus of $$\m... Let the point$$P(\alpha, \beta)$$be at a unit distance from each of the two lines$$L_{1}: 3 x-4 y+12=0$$, and$$L_{2}: 8 x+6 y+11=0$$. If$$P$$lie... A line, with the slope greater than one, passes through the point$$A(4,3)$$and intersects the line$$x-y-2=0$$at the point B. If the length of the ... Let$$\alpha$$1,$$\alpha$$2 ($$\alpha$$1 2) be the values of$$\alpha$$fo the points ($$\alpha$$,$$-$$3), (2, 0) and (1,$$\alpha$$) to be collinea... The distance of the origin from the centroid of the triangle whose two sides have the equations$$x - 2y + 1 = 0$$and$$2x - y - 1 = 0$$and whose or... The distance between the two points A and A' which lie on y = 2 such that both the line segments AB and A' B (where B is the point (2, 3)) subtend ang... Let a triangle be bounded by the lines L1 : 2x + 5y = 10; L2 :$$-$$4x + 3y = 12 and the line L3, which passes through the point P(2, 3), intersects L... In an isosceles triangle ABC, the vertex A is (6, 1) and the equation of the base BC is 2x + y = 4. Let the point B lie on the line x + 3y = 7. If ($$...
If two straight lines whose direction cosines are given by the relations $$l + m - n = 0$$, $$3{l^2} + {m^2} + cnl = 0$$ are parallel, then the positi...
Let R be the point (3, 7) and let P and Q be two points on the line x + y = 5 such that PQR is an equilateral triangle. Then the area of $$\Delta$$PQR...
Let the area of the triangle with vertices A(1, $$\alpha$$), B($$\alpha$$, 0) and C(0, $$\alpha$$) be 4 sq. units. If the points ($$\alpha$$, $$-$$$$\... Let A be the set of all points ($$\alpha$$,$$\beta$$) such that the area of triangle formed by the points (5, 6), (3, 2) and ($$\alpha$$,$$\beta$$) ... If p and q are the lengths of the perpendiculars from the origin on the lines,x cosec$$\alpha-$$y sec$$\alpha$$= k cot 2$$\alpha$$andx sin$$...
The angle between the straight lines, whose direction cosines are given by the equations 2l + 2m $$-$$ n = 0 and mn + nl + lm = 0, is :
Let A be a fixed point (0, 6) and B be a moving point (2t, 0). Let M be the mid-point of AB and the perpendicular bisector of AB meets the y-axis at C...
Let ABC be a triangle with A($$-$$3, 1) and $$\angle$$ACB = $$\theta$$, 0 < $$\theta$$ < $${\pi \over 2}$$. If the equation of the median throu...
The point P (a, b) undergoes the following three transformations successively :(a) reflection about the line y = x.(b) translation through 2 units alo...
Two sides of a parallelogram are along the lines 4x + 5y = 0 and 7x + 2y = 0. If the equation of one of the diagonals of the parallelogram is 11x + 7y...
Let the equation of the pair of lines, y = px and y = qx, can be written as (y $$-$$ px) (y $$-$$ qx) = 0. Then the equation of the pair of the angle ...
Let the centroid of an equilateral triangle ABC be at the origin. Let one of the sides of the equilateral triangle be along the straight line x + y = ...
The number of integral values of m so that the abscissa of point of intersection of lines 3x + 4y = 9 and y = mx + 1 is also an integer, is :
The equation of one of the straight lines which passes through the point (1, 3) and makes an angles $${\tan ^{ - 1}}\left( {\sqrt 2 } \right)$$ with t...
In a triangle PQR, the co-ordinates of the points P and Q are ($$-$$2, 4) and (4, $$-$$2) respectively. If the equation of the perpendicular bisector ...
Let A($$-$$1, 1), B(3, 4) and C(2, 0) be given three points. A line y = mx, m > 0, intersects lines AC and BC at point P and Q respectively. Let A1...
The intersection of three lines x $$-$$ y = 0, x + 2y = 3 and 2x + y = 6 is a :
The image of the point (3, 5) in the line x $$-$$ y + 1 = 0, lies on :
A man is walking on a straight line. The arithmetic mean of the reciprocals of the intercepts of this line on the coordinate axes is $${1 \over 4}$$. ...
Let L denote the line in the xy-plane with x and y intercepts as 3 and 1 respectively. Then the image of the point (–1, –4) in this line is :
A ray of light coming from the point (2, $$2\sqrt 3$$) is incident at an angle 30o on the line x = 1 at the point A. The ray gets reflected on the li...
If the perpendicular bisector of the line segment joining the points P(1 ,4) and Q(k, 3) has y-intercept equal to –4, then a value of k is:
Two vertical poles AB = 15 m and CD = 10 m are standing apart on a horizontal ground with points A and C on the ground. If P is the point of intersect...
If a $$\Delta$$ABC has vertices A(–1, 7), B(–7, 1) and C(5, –5), then its orthocentre has coordinates :
The set of all possible values of $$\theta$$ in the interval (0, $$\pi$$) for which the points (1, 2) and (sin $$\theta$$, cos $$\theta$$) lie on...
Let C be the centroid of the triangle with vertices (3, –1), (1, 3) and (2, 4). Let P be the point of intersection of the lines x + 3y – 1 = 0 and 3x ...
Let two points be A(1, –1) and B(0, 2). If a point P(x', y') be such that the area of $$\Delta$$PAB = 5 sq. units and it lies on the line, 3x + y – 4...
The locus of the mid-points of the perpendiculars drawn from points on the line, x = 2y to the line x = y is:
A straight line L at a distance of 4 units from the origin makes positive intercepts on the coordinate axes and the perpendicular from the origin to t...
Lines are drawn parallel to the line 4x – 3y + 2 = 0, at a distance $${3 \over 5}$$ from the origin. Then which one of the following points lies on a...
The region represented by| x – y | $$\le$$ 2 and | x + y| $$\le$$ 2 is bounded by a :
If the two lines x + (a – 1) y = 1 and 2x + a2y = 1 (a$$\in$$R – {0, 1}) are perpendicular, then the distance of their point of intersection from th...
Slope of a line passing through P(2, 3) and intersecting the line, x + y = 7 at a distance of 4 units from P, is
If the system of linear equations x – 2y + kz = 1 2x + y + z = 2 3x – y – kz = 3 has a solution (x,y,z), z $$\ne$$ 0, then (x,y) lies on the straigh...
Suppose that the points (h,k), (1,2) and (–3,4) lie on the line L1 . If a line L2 passing through the points (h,k) and (4,3) is perpendicular to L1 ,...
A point on the straight line, 3x + 5y = 15 which is equidistant from the coordinate axes will lie only in :
Let O(0, 0) and A(0, 1) be two fixed points. Then the locus of a point P such that the perimeter of $$\Delta$$AOP is 4, is :
If a straight line passing through the point P(–3, 4) is such that its intercepted portion between the coordinate axes is bisected at P, then its equa...
If the straight line, 2x – 3y + 17 = 0 is perpendicular to the line passing through the points (7, 17) and (15, $$\beta$$), then $$\beta$$ equals :
If in a parallelogram ABDC, the coordinates of A, B and C are respectively (1, 2), (3, 4) and (2, 5), then the equation of the diagonal AD is :
Two sides of a parallelogram are along the lines, x + y = 3 & x – y + 3 = 0. If its diagonals intersect at (2, 4), then one of its vertex is -
Two vertices of a triangle are (0, 2) and (4, 3). If its orthocenter is at the origin, then its third vertex lies in which quadrant
If 5, 5r, 5r2 are the lengths of the sides of a triangle, then r cannot be equal to -
A point P moves on the line 2x – 3y + 4 = 0. If Q(1, 4) and R (3, – 2) are fixed points, then the locus of the centroid of $$\Delta$$PQR is a line -
If the line 3x + 4y – 24 = 0 intersects the x-axis at the point A and the y-axis at the point B, then the incentre of the triangle OAB, where O is the...
Let the equations of two sides of a triangle be 3x $$-$$ 2y + 6 = 0 and 4x + 5y $$-$$ 20 = 0. If the orthocentre of this triangle is at (1, 1), then t...
Consider the set of all lines px + qy + r = 0 such that 3p + 2q + 4r = 0. Which one of the following statements is true ?
A straight line through a fixed point (2, 3) intersects the coordinate axes at distinct points P and Q. If O is the origin and the rectangle OPRQ is c...
The sides of a rhombus ABCD are parallel to the lines, x $$-$$ y + 2 = 0 and 7x $$-$$ y + 3 = 0. If the diagonals of the rhombus intersect P(1, 2) and...
The foot of the perpendicular drawn from the origin, on the line, 3x + y = $$\lambda$$ ($$\lambda$$ $$\ne$$ 0) is P. If the line meets x-axis at A...
In a triangle ABC, coordinates of A are (1, 2) and the equations of the medians through B and C are respectively, x + y = 5 and x = 4. Then area of $$... A square, of each side 2, lies above the x-axis and has one vertex at the origin. If one of the sides passing through the origin makes an angle 30o wi... Let k be an integer such that the triangle with vertices (k, – 3k), (5, k) and (–k, 2) has area 28 sq. units. Then the orthocentre of this triangle is... A ray of light is incident along a line which meets another line, 7x − y + 1 = 0, at the point (0, 1). The ray is then reflected from this point along... A straight line through origin O meets the lines 3y = 10 − 4x and 8x + 6y + 5 = 0 at points A and B respectively. Then O divides the segment AB in the... If a variable line drawn through the intersection of the lines$${x \over 3} + {y \over 4} = 1$$and$${x \over 4} + {y \over 3} = 1,$$meets the coo... The point (2, 1) is translated parallel to the line L : x− y = 4 by$$2\sqrt 3 $$units. If the newpoint Q lies in the third quadrant, then the equati... Two sides of a rhombus are along the lines,$$x - y + 1 = 0$$and$$7x - y - 5 = 0$$. If its diagonals intersect at$$(-1, -2)$$, then which one of t... The number of points, having both co-ordinates as integers, that lie in the interior of the triangle with vertices$$(0, 0)(0, 41)$$and$$(41, ...
Let $$PS$$ be the median of the triangle with vertices $$P(2, 2)$$, $$Q(6, -1)$$ and $$R(7, 3)$$. The equation of the line passing through $$(1, -1)$$...
Let $$a, b, c$$ and $$d$$ be non-zero numbers. If the point of intersection of the lines $$4ax + 2ay + c = 0$$ and $$5bx + 2by + d = 0$$ lies in the f...
A ray of light along $$x + \sqrt 3 y = \sqrt 3$$ gets reflected upon reaching $$X$$-axis, the equation of the reflected ray is
The $$x$$-coordinate of the incentre of the triangle that has the coordinates of mid points of its sides as $$(0, 1) (1, 1)$$ and $$(1, 0)$$ is :
If the line $$2x + y = k$$ passes through the point which divides the line segment joining the points $$(1, 1)$$ and $$(2, 4)$$ in the ratio $$3 : 2$$...
The lines $${L_1}:y - x = 0$$ and $${L_2}:2x + y = 0$$ intersect the line $${L_3}:y + 2 = 0$$ at $$P$$ and $$Q$$ respectively. The bisector of the acu...
The line $$L$$ given by $${x \over 5} + {y \over b} = 1$$ passes through the point $$\left( {13,32} \right)$$. The line K is parrallel to $$L$$ and ha...
The shortest distance between the line $$y - x = 1$$ and the curve $$x = {y^2}$$ is :
The lines $$p\left( {{p^2} + 1} \right)x - y + q = 0$$ and $$\left( {{p^2} + 1} \right){}^2x + \left( {{p^2} + 1} \right)y + 2q$$ $$=0$$ are perpendic...
Three distinct points A, B and C are given in the 2 -dimensional coordinates plane such that the ratio of the distance of any one of them from the poi...
The perpendicular bisector of the line segment joining P(1, 4) and Q(k, 3) has y-intercept -4. Then a possible value of k is
Let $$P = \left( { - 1,0} \right),\,Q = \left( {0,0} \right)$$ and $$R = \left( {3,3\sqrt 3 } \right)$$ be three point. The equation of the bisector o...
Let A $$\left( {h,k} \right)$$, B$$\left( {1,1} \right)$$ and C $$(2, 1)$$ be the vertices of a right angled triangle with AC as its hypotenuse. If th...
If one of the lines of $$m{y^2} + \left( {1 - {m^2}} \right)xy - m{x^2} = 0$$ is a bisector of angle between the lines $$xy = 0,$$ then $$m$$ is
A straight line through the point $$A (3, 4)$$ is such that its intercept between the axes is bisected at $$A$$. Its equation is
If $$\left( {a,{a^2}} \right)$$ falls inside the angle made by the lines $$y = {x \over 2},$$ $$x > 0$$ and $$y = 3x,$$ $$x > 0,$$ then a belong...
The line parallel to the $$x$$ - axis and passing through the intersection of the lines $$ax + 2by + 3b = 0$$ and $$bx - 2ay - 3a = 0,$$ where $$(a, b... If a vertex of a triangle is$$(1, 1)$$and the mid points of two sides through this vertex are$$(-1, 2)$$and$$(3, 2)$$then the centroid of the tr... If non zero numbers$$a, b, c$$are in$$H.P.,$$then the straight line$${x \over a} + {y \over b} + {1 \over c} = 0$$always passes through a fixed ... The equation of the straight line passing through the point$$(4, 3)$$and making intercepts on the co-ordinate axes whose sum is$$-1$$is Let$$A\left( {2, - 3} \right)$$and$$B\left( {-2, 1} \right)$$be vertices of a triangle$$ABC$$. If the centroid of this triangle moves on the lin... If the sum of the slopes of the lines given by$${x^2} - 2cxy - 7{y^2} = 0$$is four times their product$$c$$has the value If one of the lines given by$$6{x^2} - xy + 4c{y^2} = 0$$is$$3x + 4y = 0,$$then$$c$$equals A square of side a lies above the$$x$$-axis and has one vertex at the origin. The side passing through the origin makes an angle$$\alpha \left( {0 &...
If the pair of straight lines $${x^2} - 2pxy - {y^2} = 0$$ and $${x^2} - 2qxy - {y^2} = 0$$ be such that each pair bisects the angle between the other...
If $${x_1},{x_2},{x_3}$$ and $${y_1},{y_2},{y_3}$$ are both in G.P. with the same common ratio, then the points $$\left( {{x_1},{y_1}} \right),\left( ... Locus of centroid of the triangle whose vertices are$$\left( {a\cos t,a\sin t} \right),\left( {b\sin t, - b\cos t} \right)$$and$$\left( {1,0} \righ...
If the equation of the locus of a point equidistant from the point $$\left( {{a_{1,}}{b_1}} \right)$$ and $$\left( {{a_{2,}}{b_2}} \right)$$ is $$\le... A triangle with vertices$$\left( {4,0} \right),\left( { - 1, - 1} \right),\left( {3,5} \right)$$is Locus of mid point of the portion between the axes of$$xcos\alpha + y\,\sin \alpha = p$$where$$p$$is constant is The pair of lines represented by$$$3a{x^2} + 5xy + \left( {{a^2} - 2} \right){y^2} = 0$$are perpendicular to each other for If the pair of lines$$a{x^2} + 2hxy + b{y^2} + 2gx + 2fy + c = 0$$intersect on the$$y$$-axis then ## Numerical The equations of the sides AB, BC and CA of a triangle ABC are :$$2x+y=0,x+py=21a,(a\pm0)$$and$$x-y=3$$respectively. Let P(2, a) be the centroid o... The equations of the sides$$\mathrm{AB}, \mathrm{BC}$$and$$\mathrm{CA}$$of a triangle$$\mathrm{ABC}$$are$$2 x+y=0, x+\mathrm{p} y=15 \mathrm{a}... A ray of light passing through the point P(2, 3) reflects on the x-axis at point A and the reflected ray passes through the point Q(5, 4). Let R be th... Let $$A\left( {{3 \over {\sqrt a }},\sqrt a } \right),\,a > 0$$, be a fixed point in the xy-plane. The image of A in y-axis be B and the image of B in... Let the points of intersections of the lines x $$-$$ y + 1 = 0, x $$-$$ 2y + 3 = 0 and 2x $$-$$ 5y + 11 = 0 are the mid points of the sides of a trian... A man starts walking from the point P($$-$$3, 4), touches the x-axis at R, and then turns to reach at the point Q(0, 2). The man is walking at a const... Consider a triangle having vertices A($$-$$2, 3), B(1, 9) and C(3, 8). If a line L passing through the circum-centre of triangle ABC, bisects line BC,... A square ABCD has all its vertices on the curve x2y2 = 1. The midpoints of its sides also lie on the same curve. Then, the square of area of ABCD is ... Let tan$$\alpha$$, tan$$\beta$$ and tan$$\gamma$$; $$\alpha$$, $$\beta$$, $$\gamma$$ $$\ne$$ $${{(2n - 1)\pi } \over 2}$$, n$$\in$$N be the slopes of ... The maximum value of z in the following equation z = 6xy + y2, where 3x + 4y $$\le$$ 100 and 4x + 3y $$\le$$ 75 for x $$\ge$$ 0 and y $$\ge$$ ... If the line, 2x - y + 3 = 0 is at a distance $${1 \over {\sqrt 5 }}$$ and $${2 \over {\sqrt 5 }}$$ from the lines 4x - 2y + $$\alpha$$ = 0 and 6x - 3... If the foot of the perpendicular drawn from the point (1, 0, 3) on a line passing through ($$\alpha$$, 7, 1) is $$\left( {{5 \over 3},{7 \over 3},{{1... Let A(1, 0), B(6, 2) and C$$\left( {{3 \over 2},6} \right)$\$ be the vertices of a triangle ABC. If P is a Point inside the triangle ABC such that the...
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