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Acnologia

  • one year ago

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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  1. SA5UK3
    • one year ago
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    -y = 8-4x So when you switch the negative what happens?

  2. Acnologia
    • one year ago
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    I'm not sure what you mean by "switch the negative".

  3. warningiflirt
    • one year ago
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    do the opposite sign so 8= -8

  4. SA5UK3
    • one year ago
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    When you divide out the negative what happens to (8-4x)

  5. warningiflirt
    • one year ago
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    so what is the opposite of -4 ?

  6. Acnologia
    • one year ago
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    4.

  7. SA5UK3
    • one year ago
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    Yep @warningiflirt is right. -1 means the opposite. So take the opposite of 8-4x

  8. warningiflirt
    • one year ago
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    so you have −8 + 4x

  9. warningiflirt
    • one year ago
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    see how I did that?

  10. Acnologia
    • one year ago
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    Yeah.

  11. SA5UK3
    • one year ago
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    -y = (8 -4x) y = -(8-4x) If you know how to distribute it makes it y = -8 + 4x

  12. SA5UK3
    • one year ago
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    Cool

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