2x+3y =7 ; (a-b)x+(a+b)y =3a+b-2 . Find a and b
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x+y=7-5=2
=ax-bx+ay+by=3a+b-2
=ax+ay+by-bx=3a+b-2
=a(x+y)-b(x+y)=3a+b-2
=2a-2b=3a+b-2
=2a-3a-2b-b=2
=-a-3b=2
=a+b=2+3
a=2
b=3
hope this helps you out to complete this
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