Question

for what value of a & b, the following pair of linear equation represents the coincident lines 2x+3y=7. a(x+y)-b(x-y) =3a+b-2

Answer 1

2x+3y=7
a(x+y)-b(x-y)=3a+b-2

(a-b)x+ (a+b)y=3a+b-2
comparing
a-b=2
a+b=3. a=5/2
&b=1/2