Question 13 (Essay Worth 10 points) (Slope-Intercept Form Point-Slope Form Standard Form HC) A cell phone plan charges a one-time set-up fee and a monthly fee. For 6 months of service, the cost of the plan is $222, and for 12 months, it is $369. Part A: Write a linear equation that represents the total monthly cost of the plan, y, where x is the number of months. The equation should be written in either slope- intercept form or point-slope form. Show all work. (4 points) Part B: What form did you write the equation in for Part A? Why did you choose to write the equation in that form? (2 points) Part C: Rewrite the equation from Part A in standard form. Show all work. (4 points)