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anonymous

  • 4 years ago

How do I solve this a-b=6

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  1. TuringTest
    • 4 years ago
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    solve for what?

  2. anonymous
    • 4 years ago
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    Algebra

  3. TuringTest
    • 4 years ago
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    no, I mean that you have two unknowns and one equation, so you can't get a number answer so do you want it solved for a or b ?

  4. anonymous
    • 4 years ago
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    Its my sons homework here is the problem the way its on the sheet. a-b=6 a=2b+7

  5. anonymous
    • 4 years ago
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    for both

  6. TuringTest
    • 4 years ago
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    that changes things... you need as many equations as unknowns to solve a problem, so the other equation is essential a-b=6 a=2b+7 substitute the second expression for 'a' into the first equation: 2b+7-b=6 this can be solved for b once you have the value of b plug that number into the second equation, which gives you the value of a.

  7. anonymous
    • 4 years ago
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    so would i subtract the b or the 7 from the 6

  8. TuringTest
    • 4 years ago
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    2b+7-b=6 collect like terms: b+7=6 then subtract 7 from both sides

  9. anonymous
    • 4 years ago
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    so b=(-1)

  10. TuringTest
    • 4 years ago
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    yes, now plug that into b in the second equation a=2b+7 and you will get a

  11. anonymous
    • 4 years ago
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    is it a=5

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