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anonymous

  • 4 years ago

x − 7y = 20 x + 12y = −1 find the value for y

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  1. anonymous
    • 4 years ago
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    Hi marmar, so do you know the substitution method?

  2. anonymous
    • 4 years ago
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    Basically we're looking to build an equation that only has one variable

  3. anonymous
    • 4 years ago
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    \[x - 7y = 20\] becomes: \[x = 20 + 7y\]

  4. anonymous
    • 4 years ago
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    So can you write your second equation using this value for x?

  5. myininaya
    • 4 years ago
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    That is one way you could multiply your first equation by -1 and then add the equations.

  6. anonymous
    • 4 years ago
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    Good point myin - that's probably easier here huh?

  7. myininaya
    • 4 years ago
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    Maybe they like your better.

  8. anonymous
    • 4 years ago
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    I ALWAYS think in terms of substitution - to a fault ;)

  9. anonymous
    • 4 years ago
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    wow two moderators on one problem!

  10. myininaya
    • 4 years ago
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    Do you prefer substitution or elimination @ marmar? (

  11. anonymous
    • 4 years ago
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    Ha satellite - two moderators, a resident expert, and no question asker...

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