Answer:
4 cassettes and 5 CDs
Step-by-step explanation:
Create a system of equations
c is cassettes and d is CDs
6c+10d=74
c+d=9
I will use substitution
c=9-d
6(9-d)+10d=74
54-6d+10d=74
4d=20
d=5
Plug 5 back into the equation
c+5=9
c=4
5
x=-42 to check ur answer place it like this 7-(-42) =49 which is correct
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