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For what values of a and b are the following equations both true?
a+2b=1
-3a-8b=1

  • math -

    multiply all terms in first equation by 4
    +4a+8b = 4
    -3a-8b = 1 now add
    ---------
    1a+0b = 5 or a = 5
    so use 5 for a in equation 1
    5 + 2b = 1
    2 b = -4
    b = -2

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