Question 72379
Solve the following systems: 

1.)x/a+y=2b, 
x/b-y=a-b      sol is :  after adding the two equations
                         we get x = ab ,substitute the value of x in any of the equation we get y = b.

2.)ax-by=0, 
x+y=a+b/ab   sol : after adding the two equations we get a = 1/a and y = 1/b.

3.)x+b/a+y-b/b=a+b/b,
x-a/b-y-a/a=-a+b/a          i am not able to get u'r question because typing fault i think so