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23 May, 16:53

If 8a-4b=20 and 4a-8b=4, then what is the value of a-b?

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Answers (2)
  1. 23 May, 19:21
    0
    I’m more than likely wrong but 2 and 5
  2. 23 May, 20:38
    0
    First simplify the equations to make it easier.

    2a-b=5

    a-2b=1

    a=1+2b

    plug that into the first equation.

    2+4b-b=5

    b=1

    a=3

    3-1=2 your answer therefore is 2.
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