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27 March, 17:34

Solve the simultaneous equations 5x-y=8

7x+4y=22

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  1. 27 March, 17:40
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    5x-y=8; y = 5x - 8

    7x+4y=22

    substitute y = 5x - 8 into 7x+4y=22

    7x+4y=22

    7x+4 (5x - 8) = 22

    7x + 20x - 32 = 22

    27x = 54

    x = 2

    y = 5x - 8

    y = 5 (2) - 8

    y = 10 - 8

    y = 2

    answer: x = 2 y = 2 or (2,2)
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