The graph shows the relationship between inches, x, and miles, y, on a map. Which equation represents the proportional relationship?
y = x + 5
y = one-fifth x
y = 5x
y = 10x

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons