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6 December, 08:42

If x+7=2y and y=2x-1, what is the value of y?

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  1. 6 December, 11:41
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    y = 5

    Step-by-step explanation:

    x + 7 = 2y ... (i)

    y = 2x - 1 ... (ii)

    x = 2y - 7 ... (i)

    y = 2x - 1 ... (ii)

    Replacing x in (i) into the x in (ii) we get:

    y = 2 (2y - 7) - 1 ... (ii)

    y = 4y - 14 - 1

    3y = 15

    y = 15/3 = 5

    So y = 5 and x = 2 (5) - 7 = 3
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