Last summer, Ben purchased materials to build model airplanes and then sold the finished
models. He sold each model for the same amount of money. The table below shows the
relationship between the number of model airplanes sold and the running total of Ben's
profit.(TABLE IS ATTACHED AS A IMAGE)

question 1: write a linear equation, in slope intercept form, to represent the amount of ben’s total profit (y) based on the number of model airplanes (x) he sold.

question 2:how much did ben spend on his model-building materials? explain how you got your answer.

question 3: what is the fewest number of model airplanes ben needed to sell in order to make a profit?