jquinones70 jquinones70

23-01-2020
Mathematics

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Best Buy sells CDS and DVDS. Jose bought 3 CDs and 2 DVDs for $58. Lisbeth bought 1 CD and 4 DVDs for $46. Determine the selling price for each

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jpyon3019 jpyon3019

23-01-2020

CDs=c
DVDs=d
Jose 3c+2d=58
Lisbeth c+4d=46
Multiply lisbeth by 3
Lisbeth 3c+12d=46
Subtract
3c+2d=58
3c+12d=138
0c-10d=-80
Divide by -10
-10d=-80
d=8
Plug back into original equation (you can chose)
c+4d=46
c+4(8)=46
c+32=46
c=14
CDs=$14. DVDs=$8

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