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25 June, 07:07

Substitution y=3x+8; 5x+2y=5

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  1. 25 June, 07:16
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    Y = 3x + 8

    5x + 2y = 5

    5x + 2 (3x + 8) = 5

    5x + 2 (3x) + 2 (8) = 5

    5x + 6x + 16 = 5

    11x + 16 = 5

    - 16 - 16

    11x = - 11

    11 11

    x = - 1

    y = 3x + 8

    y = 3 (-1) + 8

    y = - 3 + 8

    y = 5

    (x, y) = (-1, 5)
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