Let y = total charge for a car rental and x = miles driven Proxy car equation: y = 0.32x + 18 YourPal equation: y = 0.36x + 12
Set equations right sides equal to each other... meaning their cost, y, are equal 0.32x + 18 = 0.36x + 12 18 = 0.04x + 12 (subtract 0.32x from both sides of the equation) 6 = 0.04x (subtract 12 from both sides of the equation) 150 = x (divide both sides of the equation by 0.04) ANSWER: 150 miles
