Chapter 6 - Systems of Equations and Inequalities - 6-1 Solving Systems by Graphing - Standardized Test Prep - Page 365: 45

a)$y=20$ and $2.5x+5 =y$ b) 6 hours c) Garage A is cheaper. The total cost is 12.50 (compared to garage B's cost of 20).

a) x = number of hours, y = total cost Garage A: $2.5x+5 =y$ Garage B: $y=20$ b) $2.5x+5 = 20$ $2.5x + 5 - 5 = 20-5$ $2.5x = 15$ $2.5x/2.5 = 15/2.5$ $x = 6$ c) $y=2.5x+5$ $y=2.5*3 + 5$ $y=7.5 + 5$ $y = 12.5$ $y=20$