17. Choose the answer that correctly interprets the slope and y-intercept of the equation t = 20.5 +10.5h. 8.AR.3.5 A Maddy earned $10.50 per hour delivering groceries, and she made $20.50 in tips. Maddy earned $20.50 per hour delivering groceries, and she made $10.50 in tips. Maddy earned $31.00 delivering groceries. Maddy earned $10.50 for delivering groceries for one hour, and she made $20.50 in tips.