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5 August, 06:29

What is X+y=-1

X-y=7

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  1. 5 August, 06:35
    0
    Step-by-step explanation:

    X+y=-1

    X-y=7

    Ys are additive inverse's.

    X+x+y-y=7-1

    2x=6

    X=3

    Plug x=3 into x+y=-1

    3+y=-1

    -3 both sides

    Y=-4
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