The equation to a pair of opposite sides of a parallelogram are `x^2-5x+6=0` and `y^2+5=0` . The equations to its diagonals are `x+4y=13 ,y=4x-7` (b) `4x+y=13 ,4y=x-7` `4x+y=13 ,y=4x-7` (d) `y-4x=13 ,y+4x-7`