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Ilya [14]
3 years ago
11

I need to know this answer so I can get the answer

Mathematics
2 answers:
Naddik [55]3 years ago
4 0
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
gladu [14]3 years ago
3 0
58 cds and and 34 dvds
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