1. (10 pts) Read the sections "Model formulation" (p.32), and "Characteristics of Linear Programming Problems" (p. 57). State whether each equation below is linear, and if it is not, explain why not? a. Y = mx + b True / False b. Y = ax^2 True / False C. Y = axi + bx2 + CX3 True / False d. Y = ax2 + bx + c True / False e. Y = (a/d)x + (b/a)x+ c True / False