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15 September, 14:06

Solve using the substitution method - 7x+y = 42 and 5x+13y = 66

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  1. 15 September, 17:36
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    -7x+y=42

    y=42+7x

    5x+13y=66

    Substitute for y (meaning put 42+7x into the equation above instead of y because they are equal - see second line of my answer above)

    5x+13[42+7x] = 66

    5x + 546 = 66

    5x=66-546

    5x=-480

    x=-480/5

    x=-96
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