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26 February, 11:17

How to solve x-y=102x-y=17

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  1. 26 February, 12:46
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    X-y=10

    2x-y=17

    So to start

    x=10+y

    now replace x in the second equation

    2 (10+y) - y=17

    20+2y-y=17

    20+y=17

    y=17-20

    y=-3

    Now replace y with - 3 in any equation to find x

    x - (-3) = 10

    x+3=10

    x=10-3

    x=7
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