Question

In two linear equations a1x+b1y+C1=0 and a2x+b2y+c2=0.​

Answer 1

Given a1x+b1y+c1=0........1

a2x+b2y+c2=0......2

from (1) we have

c= -by-ax..........3

from (1) and (2) we have

a1x+b1y+c1=0

a2x+b2y+c2=0

___________

a3x+b3y+3c=0

Now using (3)

a3x+b3y+3(-by-ax) =0

a3x+b3y-3 by-3ax=0

0=0