Thread: elimination method - need help

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.

thats what I tried doing and I'm getting x= 10/9 and y= -9/15 but when I plug it in to check, it isn't right?

Hi,

You can turn the 2 equations into the following form:

10x-6y=3
12x+6y=8

Add these together, and you get x then y follows.

I agree - your answer isn't right!