solve by elimination method

1/2 x + 1/4 y = 1/3

2/3 x - 2/5 y = 1/5

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- Oct 20th 2008, 11:02 AMmathdummy22elimination method - need help
solve by elimination method

1/2 x + 1/4 y = 1/3

2/3 x - 2/5 y = 1/5 - Oct 20th 2008, 11:24 AMTony2710
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. - Oct 20th 2008, 11:27 AMmathdummy22
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?

- Oct 20th 2008, 11:36 AMTony2710
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!