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8 October, 03:19

8a - 4b = 20

5a - 8b = 62

What are the values of a and b?

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  1. 8 October, 03:24
    0
    a=2, b = (-1)

    Step-by-step explanation:

    8a-4b=20 / * (-2)

    5a-8b=62

    -16a+8b = - 40

    5a-8b=62

    now - 8+8=0 right? so the only parameter that we have is a.

    -16a+5a = - 40+62

    11a = 22 / (:11)

    a=2

    in order to find b, we will replace a with its value in one of the original equations (it doesn't matter which one you will choose). For instance, I chose the first one.

    8*2-4b=20

    -4b=20-16

    -4b=4/: (-4)

    b = - 1
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