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4x-7y=10 y=x-7 using the substitution method

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  1. 22 May, 19:50
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    Y = x - 7 ... so we sub in x - 7 for y in the other equation

    4x - 7y = 10

    4x - 7 (x - 7) = 10

    4x - 7x + 49 = 10

    4x - 7x = 10 - 49

    -3x = - 39

    x = - 39/-3

    x = 13

    y = x - 7

    y = 13 - 7

    y = 6

    solution is (13,6)
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