solve by elimination method
1/2 x + 1/4 y = 1/3
2/3 x - 2/5 y = 1/5
Hey,
this is a little bit nasty!
What I would do is multiply the second equation by 3/4, making the coefficients of the x-terms the same. The take one equation from the other which will give you an expression in y only. find y, then sub this value of y into one of the first equations to get x. Then you're done.