A faucet is used to add water to a large bottle that already contained some water. After it has been filling for 4 seconds, the gauge on the bottle indicates that it contains 19 ounces
of water. After it has been filling for 11 seconds, the gauge indicates the bottle contains 47
ounces of water. Let y be the amount of water in the bottle x seconds after the faucet was
turned on. Write a linear equation that models the amount of water in the bottle in terms
of x.