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30 June, 09:31

What is (x, y) if y+2x=3 and y-x=-9

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  1. 30 June, 11:40
    0
    So use subsituteion

    make y-x=-9

    change it to subsitute

    y-x=-9

    add x to both sides

    y=x-9

    susitute x-9 for y in y+2x=3

    x-9+2x=3

    3x-9=3

    add 9 both sides

    3x=12

    divide both sides by 3

    x=4

    subsitute

    y=x-9

    y=4-9

    y=-5

    x=4

    y=-5

    (4,-5)
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