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AEB047

  • 3 years ago

How do you find a b and c for a=-b+3 a+2c=10 -b+c=3

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  1. jim_thompson5910
    • 3 years ago
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    Solve -b+c=3 for c to get c = b+3

  2. jim_thompson5910
    • 3 years ago
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    Now plug a = -b+3 into the second equation to get a+2c=10 (-b+3)+2c=10 -b+3+2c=10 Then plug in c = b+3 to get -b+3+2c=10 -b+3+2(b+3)=10 Solve this last equation for b. Tell me what you get.

  3. AEB047
    • 3 years ago
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    What do you plug c=b+3 into?

  4. jim_thompson5910
    • 3 years ago
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    into -b+3+2c=10

  5. jim_thompson5910
    • 3 years ago
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    notice how I replaced 'c' with b+3

  6. AEB047
    • 3 years ago
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    thanks

  7. AEB047
    • 3 years ago
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    b=1?

  8. jim_thompson5910
    • 3 years ago
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    yes good

  9. jim_thompson5910
    • 3 years ago
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    you can now use this to find 'a' and 'c'

  10. AEB047
    • 3 years ago
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    a=2

  11. AEB047
    • 3 years ago
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    c=4

  12. jim_thompson5910
    • 3 years ago
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    good

  13. jim_thompson5910
    • 3 years ago
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    all 3 are correct

  14. AEB047
    • 3 years ago
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    thanks!

  15. jim_thompson5910
    • 3 years ago
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    yw

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