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13 March, 23:22

GH=7y+3, HI=3y-5, GI=9y+7. What is the value of Y

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  1. 14 March, 01:17
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    GH = 7y + 3, HI = 3y - 5, GI = 9y + 7

    7y + 3 + 3y - 5 = 9y + 7

    10y - 2 = 9y + 7

    10y - 9y = 7 + 2

    y = 9 <===

    lets check that ...

    7 (9) + 3 + 3 (9) - 5 = 9 (9) + 7

    63 + 3 + 27 - 5 = 81 + 7

    93 - 5 = 81 + 7

    88 = 88 (correct)

    so yes, y = 9
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