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26 December, 14:44

Y = 5x - 13

4x + 3y = 18

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  1. 26 December, 15:11
    0
    replace Y = 5x - 13

    into

    4x + 3y = 18

    4x + 3 (5x - 13) = 18

    4x + 15 - 39 = 18

    4x - 24 = 18

    4x = 18 + 24

    4x = 42

    x = 42/4

    x = 10.5

    Y = 5 (10.5) - 13

    = 52.5 - 13

    = 39.5

    answer: x = 10.5 and y = 39.5
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