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NathaliaMA13

  • one year ago

Which of the following ordered pairs represents the solution to the system given below? x − 3y = 12 2x + 6y = 60 (0, −4) (12, 0) (3, 21) (21, 3)

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  1. NotTim
    • one year ago
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    rearrange one of the equations to solve for y or x, and then sub it into another.

  2. anonymous
    • one year ago
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    So take the first equation and make it \[-3y = -x + 12\]

  3. anonymous
    • one year ago
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    Which is \[-y = \frac{ -x }{ -3} - 4\]

  4. anonymous
    • one year ago
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    i meant y not -y

  5. anonymous
    • one year ago
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    y = \[1/3x -4\]

  6. anonymous
    • one year ago
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    so then take that and plug it in to 2x + 6y = 60 \[2x + 6(1/3x−4) = 60\] and then simplify

  7. NotTim
    • one year ago
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    Agh, don't tell them the answer.

  8. anonymous
    • one year ago
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    I didn't...

  9. NathaliaMA13
    • one year ago
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    @NotTim @Jackmullen10 do I use the substitution method.

  10. NotTim
    • one year ago
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    Yes. Definitely. that's what he and I said.

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