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11 October, 05:40

What is the solution to this system of linear equations? y - 4x = 7 2y + 4x = 2 (3, 1) (1, 3) (3, - 1) (-1, 3)

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  1. 11 October, 06:26
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    Y - 4x = 7 ... y = 4x + 7

    now sub 4x + 7 in for y in the other equation

    2y + 4x = 2

    2 (4x + 7) + 4x = 2

    8x + 14 + 4x = 2

    12x = 2 - 14

    12x = - 12

    x = - 1

    y - 4x = 7

    y - 4 (-1) = 7

    y + 4 = 7

    y = 7 - 4

    y = 3

    solution is : (-1,3)
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