`m=` number of medium pizzas
`l=` number of large pizzas
Since medium pizza costs $5 and large costs $8 you have $40 to spend your equation is
`5m+8l=40`
Note that both `m` and `l` must be positive integers.
Possible solutions are `(m,l)=(8,0)` and `(m,l)=(0,5).`
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