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9 October, 13:33

Solve this system of equations using any method. 3x - y = 4 x + 2y = 13

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  1. 9 October, 14:37
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    3x-y=4

    x+2y=13

    elimination

    multiply first equation by 2 and add to second

    6x-2y=8

    6x-2y=8

    x+2y=13 +

    7x+0y=21

    7x=21

    divide 7

    x=3

    sub

    x+2y=13

    3+2y=13

    minu 3

    2y=10

    divide 2

    y=5

    x=3

    y=5

    (3,5)
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