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27 July, 07:41

If 5x + 3y = 12 and 4x - 5y = 17, what is y?

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  1. 27 July, 07:59
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    y=-1

    Step-by-step explanation:

    5x + 3y = 12 ... (*)

    4x - 5y = 17 ... (**)

    multiply (*) by : - 4 and (**) by 5

    you have : - 20x - 12 = - 48 ... (1)

    20x - 25y = 85 ... (2)

    add (1) and (2) : - 37y = 37 so : y = 37/-37 = - 1
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