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OpenStudy (anonymous):
The cost of eleven CDs and one DVDs is $69.41; and the cost of seven DVDs and twelve CDs is $112.11. How much do a CD and a DVD cost?
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OpenStudy (anonymous):
x=5.75 y=6.16
OpenStudy (anonymous):
11x + y =69.41 12x+7y=112.11 12x/7+1y=112.11/7 11x-12x/7 = 69.41-112.11/7 65/7x = 373.76/7 65x=373.76 x=373.76/65 x= 5.75 then work in x for y
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