13-05-2017
Mathematics

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yousefhamed yousefhamed

13-05-2017

CD=50 DVD=40
5C+7D=530

C=D+10
C-D=10
Solve the system
5C+7D=530
5C-5D=50 (multiply by 5)
Subtract
12D=480
D=40
Substitute in any of the equations
C-D=10
C-40=10
C=50

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will1i1ace1it32 will1i1ace1it32

13-05-2017

58 cds and and 34 dvds

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