Joel bought a new tablet. He paid $100 toward the purchase price of the tablet and will continue to pay $50 every month until the tablet is paid off. Which equation represents the relationship between x, the number of monthly payments Joel has made, and y, the total amount Joel has paid toward the price of the tablet?

y=50x−100

y = 50x +100

y = 100x + 50

y=100x−50