# The equation axy+bx+cy+d=0 represents a pair of straight lines, then

130 views
in JEE

The equation axy+bx+cy+d=0 represents a pair of straight lines, then

(b) the lines are parallel

(c) the lines cannot be parallel

(d) the lines are coincident

by (35 points)

the lines cannot be parallel because the coefficients of x2 and y2     are 0 but the coefficients x and y are not 0.hence the lines are in the form "l1x+m1=0"and "l2y+m2=0" which are clearly perpendicular. so the aanswer is (c)