EZ!
Let's say each box costs $X and each program costs $Y
Thus, Mike's family spent:
$(5X+3Y)
or
$41
Sean's family spent
$(3X+2Y)
or
$26
This yields us a system of two equations:
5x+3y=41
3x+2y=26
5x+3y=41
2y=26-3x
5x+3y=41
y=13-1.5x
5x+3(13-1.5x)=41
y=13-1.5x
5x+39-4.5x=41
y=13-1.5x
0.5x+39=41
y=13-1.5x
0.5x=2
y=13-1.5x
x=4
y=13-1.5x
x=4
y=7
Each box costs $4 and each program costs $7