The given graph describes the relationship between the total cost that a plumber charges,y of a repair that takes x hours. Write an equation in slope-intercept form to model this situation.
1. What is the equation of a line in slope-intercept form?
2. How can you find the slope or the rate of change by looking at the graph?
3. What is the meaning of the slope?
4. How can you identify the b or y-intercept by looking at the graph?
5. What is the meaning of the y-intercept?