Question

The equation of the straight line which passes through the point (1, - 2) and cuts off equal intercepts from axes, is [MNR 1978]
A) x+y=1 B) x-y=1 C) x+y+1=0 D) x-y-2=0

Answer 1

let the length of the intersepts = a
then equation of the line in intercept form is
x/a+y/a = 1
x+y = a
it passes through (1,-2) so
1-2 = a
a = -1
hence the equation is c) x+y+1=0