resolva o sistema pelo método da subistiuiçao 2x+y=7 e 5x-2y=-5?

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  • 8 years ago

    2x+y=7

    y=7-2x

    5x-2y=-5

    5x-2(7-2x)=-5

    5x-14+4x=-5

    9x=-5-14

    9x=-9

    x=-1

    y=7-2x

    y=7-2(-1)

    y=7+2

    y=9

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