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6 May, 18:29

tina has 50 coins, all dimes and quarters. the value of the coins is $7.10. write a system of equations to determine how many dimes and how many quarters tina has

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  1. 6 May, 22:27
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    A) D + Q = 50

    B).10D +.25Q = 7.10

    We multiply A) by -.10

    A) -.10D -.10Q = - 5 then adding this to B)

    B).10D +.25Q = 7.10

    .15Q = 2.10

    Quarters = 14 = 3.50

    Dimes = 36 = 3.60
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