math

Solve the elimination method.
4x-9y=18.5
7y-2x=10.5

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  1. multiply first one by 7 and second one by 4

    28 x - 63 y = 129.5
    28 x - 8 y = 42
    -------------------- subtract
    -55 y = 87.5

    y = - 1.591
    then go back to get x

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