xokatexo
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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xokatexo
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can you show the substitution work?
zepdrix
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|dw:1348685007820:dw|
try to solve for Q from here :)
xokatexo
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q=-.56
xokatexo
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thats not right....
zepdrix
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hmm lets see
xokatexo
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Q(Q-7)=2.80
2Q-7Q=2.80
-5Q=2.80
---- ------
-5 -5
Q=-.56
xokatexo
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@zepdrix
zepdrix
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woops don't get confused by my brackets :C
Q+(Q-7) = Q+Q-7
xokatexo
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wait what?
zepdrix
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oh woops i messed up from the start T.T oh goodness. im sorry bout that.. need to fix that..
kropot72
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The two equations are as follows:
25Q + 10d = 280
d = Q - 7
zepdrix
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yah what kropot said, sorry bout that :C
xokatexo
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k got it THANKS @kropot72
kropot72
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You're welcome :)