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Please help. I will fan and give medal to whoever succeeds in helping me. For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation? 4x − y = 8 2x + 3y = 9 8 − 4x 8 + 4x −8 + 4x −8 − 4x

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-y = 8-4x So when you switch the negative what happens?
I'm not sure what you mean by "switch the negative".
do the opposite sign so 8= -8

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Other answers:

When you divide out the negative what happens to (8-4x)
so what is the opposite of -4 ?
Yep @warningiflirt is right. -1 means the opposite. So take the opposite of 8-4x
so you have −8 + 4x
see how I did that?
-y = (8 -4x) y = -(8-4x) If you know how to distribute it makes it y = -8 + 4x

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