Question 830113: A retail music shop sells old CD’s for $8.00 each and old cassettes for $3.00 apiece. On a recent sales day, they sold a total of 1200 CD’s and cassettes (combined) and took in $7100 in revenues. How many CD’s were sold that day? What was the total dollar sales of cassettes alone?
I got 700 CD's at $8 = $5,600
and 500 Cassettes at $3 = $1,500
I just can't figure out the equation that would give me those answers
I tried x+y=1200 and 2x-y=2 but I can't figure how to fit in another equation with the total price of $7,100. Please help!!
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! ---
x = CD's sold
y = Cassettes sold
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x + y = 1200
8x + 3y = 7100
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copy and paste the above linear system in standard form into this matrix-method solver:
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solution:
x = CD's sold = 700
y = Cassettes sold = 500
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CD revenue = 8*700 = $5600
Casette revenue = 3*500 = $1500
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