Question

If 2x- 3y = 7 and (a+b)x- (a+b-3)y = 4a + b represent conincident lines then prove that a-5b = 0

Answer 1

For Coincidence line ratio of coefficient should be equal.
.

on solving first two we get
a+b =-6
so k=-1/3

we get 4a+b = -21
a+b =-6

so a = -5 and b =-1

Hope it helps.
Please mark it as brainliest if you like it and follow me.