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in JEE by (49 points)

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

(a) bc=ad

(b) the lines are parallel

(c) the lines cannot be parallel

(d) the lines are coincident

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1 Answer

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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)

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