Profit = Revenue - Cost
Revenue = Q * P
P = 100 - Q/20
C = 0.12Q + 10
Using substitution, we can say that:
[tex]\begin{gathered} \text{Profit = Revenue - Cost} \\ \text{Profit = }(Q\times P)-(0.12Q+10) \\ \text{Profit }=Q(100-\frac{Q}{20})-(0.12Q+10) \end{gathered}[/tex]
Both equations used in the region of profit are linear equations because the exponent or degree used is only 1. Therefore, the region of profit is contained within two linear equations. (Option E)
