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3 May, 21:40

Emily has 8 coins in her purse totaling 50 cents. The only kinds of coins she has are nickels and dimes. How many nickels does Emily have?

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  1. 3 May, 23:21
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    5x + 10y = 50

    x + y = 8

    x = 8 - y

    5 * (8-y) + 10y = 50

    40 - 5y + 10y = 50

    10y - 5y = 50 - 40

    5y = 10

    y = 2

    x + y = 8

    x + 2 = 8

    x = 8 - 2

    x = 6

    She has 6 nickels and 2 dimes
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