Question

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?

Answer 1

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?

Answer 2

cd = 5.75
dvd = 6.16

Answer 3

\[C = 9344/1625\approx5.75015=$5.75, D = 40029/6500\approx6.15831=$616\]

Answer 4

u forgot the decimal point for d's answer :p