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3 November, 17:32

2x + 4y = - 4

x - 3y = - 12

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  1. 3 November, 19:19
    0
    1) 2x+4y=-4

    2x=-4-4y

    (x=-2-2y)

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

    -4-4y+4y=-4

    [y=0]

    2x+4 (0) = - 4

    2x=-4

    [x=-2]

    check: 2 (-2) + 4 (0) = - 4, [-4=-4]

    2) x-3y=-12

    (x=-12+3y)

    (-12+3y) - 3y=-12

    [y=0]

    x-3 (0) = - 12

    [x=-12]

    check:

    (-12) - 3 (0) = - 12, [-12=-12]
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