Systems of Equations

T

thesloc

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Apr 11, 2005
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Hey guys, I came across this problem today that puzzled me.

y=-x +7
3/4x = 151/4 - 4y

So I'm supposed to use substitution right? But I have to isolate the 3/4, so how do I do that? I know this question is probably very easy, I just have no idea right now...I've been doing a lot of stuff such as volunteering etc, and i'm sleepy right now, probably as to why i can't think fully...thanks for any input on how to solve it using subsitution.
 
It looks like you already have an oppurtunity to use substitution. You know
y=-x+7, try substituting this in for y in the second equation and solve for x.
Then once you know x replace that in either of the original equations to
solve for y.
 
ah, thanks opticaltempest. I think I have the answer. X=-3 Y=10 so (-3, 10)
 
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