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21 May, 17:14

How to solve 2x+y=2 and x+y=-1

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  1. 21 May, 19:04
    0
    So

    2x+y=2

    x+y=-1

    multiply secion equation by - 1

    -x-y=1

    add to first equation

    2x-x+y-y=2+1

    x=3

    subsitute

    3+y=-1

    subtract 3

    y=-4

    x=3

    y=-4
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