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xokatexo

  • 3 years ago

1. Vicki has $2.80 in quarters and dimes. The number of dimes is 7 less than the number of quarters. Find the number she has of each kind. 2. A purse containing $3.20 in quarters and dimes has, in all, 20 coins. Find the number of each kind of coin.

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  1. xokatexo
    • 3 years ago
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    can you show the substitution work?

  2. zepdrix
    • 3 years ago
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    |dw:1348685007820:dw| try to solve for Q from here :)

  3. xokatexo
    • 3 years ago
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    q=-.56

  4. xokatexo
    • 3 years ago
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    thats not right....

  5. zepdrix
    • 3 years ago
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    hmm lets see

  6. xokatexo
    • 3 years ago
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    Q(Q-7)=2.80 2Q-7Q=2.80 -5Q=2.80 ---- ------ -5 -5 Q=-.56

  7. xokatexo
    • 3 years ago
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    @zepdrix

  8. zepdrix
    • 3 years ago
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    woops don't get confused by my brackets :C Q+(Q-7) = Q+Q-7

  9. xokatexo
    • 3 years ago
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    wait what?

  10. zepdrix
    • 3 years ago
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    oh woops i messed up from the start T.T oh goodness. im sorry bout that.. need to fix that..

  11. kropot72
    • 3 years ago
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    The two equations are as follows: 25Q + 10d = 280 d = Q - 7

  12. zepdrix
    • 3 years ago
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    yah what kropot said, sorry bout that :C

  13. xokatexo
    • 3 years ago
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    k got it THANKS @kropot72

  14. kropot72
    • 3 years ago
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    You're welcome :)

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