Solving system of equations by graphing

20points

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Which graph represents the linear function below? y-4= (4/3)(x-2)