WB JEE 2019 | Straight Lines and Pair of Straight Lines Question 46 | Mathematics

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

A variable line passes through the fixed point $$(\alpha ,\beta )$$. The locus of the foot of the perpendicular from the origin on the line is

$${x^2} + {y^2} - \alpha x - \beta y = 0$$

$${x^2} - {y^2} + 2\alpha x + 2\beta y = 0$$

$$\alpha x + \beta y \pm \sqrt {({\alpha ^2} + {\beta ^2})} = 0$$

$${{{x^2}} \over {{\alpha ^2}}} + {{{y^2}} \over {{\beta ^2}}} = 1$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.25

If the point of intersection of the lines 2ax + 4ay + c = 0 and 7bx + 3by $$-$$ d = 0 lies in the 4th quadrant and is equidistant from the two axes, where a, b, c and d are non-zero numbers, then ad : bc equals to

2 : 3

2 : 1

1 : 1

3 : 2

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

The point Q is the image of the point P(1, 5) about the line y = x and R is the image of the point Q about the line y = $$-$$ X. The circumcentre of the $$\Delta$$PQR is

(5, 1)

($$-$$ 5, 1)

(1, $$-$$ 5)

(0, 0)

WB JEE 2018

MCQ (Single Correct Answer)

-0.25

The angular points of a triangle are A($$-$$ 1, $$-$$ 7), B(5, 1) and C(1, 4). The equation of the bisector of the angle $$\angle $$ABC is

x = 7y + 2

7y = x + 2

y = 7x + 2

7x = y + 2

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