1

### IIT-JEE 1999

Lt $$PQR$$ be a right angled isosceles triangle, right angled at $$P(2, 1)$$. If the equation of the line $$QR$$ is $$2x + y = 3,$$ then the equation representing the pair of lines $$PQ$$ and $$PR$$ is
A
$$3{x^2} - 3{y^2} + 8xy + 20x + 10y + 25 = 0$$
B
$$3{x^2} - 3{y^2} + 8xy - 20x - 10y + 25 = 0$$
C
$$3{x^2} - 3{y^2} + 8xy + 10x + 15y + 20 = 0$$
D
$$3{x^2} - 3{y^2} - 8xy - 10x - 15y - 20 = 0$$
2

### IIT-JEE 1998

If $$\left( {P\left( {1,2} \right),\,Q\left( {4,6} \right),\,R\left( {5,7} \right)} \right)$$ and $$S\left( {a,b} \right)$$ are the vertices of a parrallelogram $$PQRS,$$ then
A
$$a = 2,\,b = 4$$
B
$$a = 3,\,b = 4$$
C
$$a = 2,\,b = 3$$
D
$$a = 3,\,b = 5$$
3

### IIT-JEE 1998

The diagonals of a parralleogram $$PQRS$$ are along the lines $$x + 3y = 4$$ and $$6x - 2y = 7$$. Then $$PQRS$$ must be a.
A
rectangle
B
square
C
D
rhombus.
4

### IIT-JEE 1995

The orthocentre of the triangle formed by the lines $$xy=0$$ and $$x+y=1$$ is
A
$$\left( {{1 \over 2},\,{1 \over 2}} \right)$$
B
$$\left( {{1 \over 3},\,{1 \over 3}} \right)$$
C
$$\left( {0,\,0} \right)$$
D
$$\left( {{1 \over 4},\,{1 \over 4}} \right)$$

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Class 12