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OpenStudy (anonymous):
the cost of eleven cds and one dvds is $69.41; and the cost of seven dvds and 12 cds is $ 112.11. How much do a cd and dvd cost?
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OpenStudy (anonymous):
11C+D=$69.41 12C+7D=$112.11 where C is the cost of one CD and D is the cost of one DVD Then you just solve that system of equations for C and D. You know how to do that?
OpenStudy (lilg132):
cd = 5.75 dvd = 6.16
OpenStudy (anonymous):
\[C = 9344/1625\approx5.75015=$5.75, D = 40029/6500\approx6.15831=$616\]
OpenStudy (lilg132):
u forgot the decimal point for d's answer :p
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