Acnologia
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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SA5UK3
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-y = 8-4x
So when you switch the negative what happens?
Acnologia
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I'm not sure what you mean by "switch the negative".
warningiflirt
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do the opposite sign so 8= -8
SA5UK3
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When you divide out the negative what happens to (8-4x)
warningiflirt
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so what is the opposite of -4 ?
Acnologia
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4.
SA5UK3
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Yep @warningiflirt is right. -1 means the opposite. So take the opposite of 8-4x
warningiflirt
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so you have −8 + 4x
warningiflirt
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see how I did that?
Acnologia
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Yeah.
SA5UK3
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-y = (8 -4x)
y = -(8-4x)
If you know how to distribute it makes it
y = -8 + 4x
SA5UK3
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Cool