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20 October, 10:30

Solve the system of equations x+4y=15 2x-y=-15

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  1. 20 October, 12:14
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    x+4y=15 2x-y=-15

    We have to make x neg.

    -2 (x) + 4y (-2) = - 2 (15)

    -2x-8y=-30

    2x-y=-15

    -9y = - 45

    Solve for y

    Y=-45/-9

    Y = 5

    Substitute your y answer into one original equation to find x.

    x+4y=15

    X+4 (5) = 15

    X+20=15

    X=15-20

    X = - 5

    Answer is (-5,5)
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