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17 September, 22:57

If (x, y) is a solution to the system of equations, what is the value of y?

x + 1/8y = 20

x + 1/4y = 4

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  1. 17 September, 23:22
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    X+1/8y=20

    X+2/8y=4 (converted the fraction so also has denominator 8)

    Subtract the first from the second equation

    1/8y=-16

    Y=-128

    Plug in to get x and check it.

    X+1/8 (-128) = 20

    X-16=20

    X=36

    Check with second equation.

    X+1/4 (-128) = 4

    X-32=4

    X=36

    So y = - 128
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