The graph shows the relationship between the number of comic books Priya buys at the store and the amount of money in dollars that Priya has left after buying the comic books.

1. What is the vertical intercept and what does it mean in this situation?
2. What is the horizontal intercept and what does it mean in this situation?
3. What is the slope of this line and what does it mean in this situation?
4. Write an equation that represents this line where represents the number of comic books Priya buys and represents how many dollars Priya has left.
5. If Priya buys 3 comic books, how much money will she have remaining?

Graph of a line, origin O, with grid. Horizontal axis, comics, scale 0 to 5, by 1’s. Vertical axis, dollars, scale 0 to 20, by 5’s. Line begins at 0 comma 20 and ends at 5 comma 0.

A container of fuel empties at a rate of 5 gallons per second. A graph representing this situation is drawn in the coordinate plane, where is the number of seconds that have passed since the container started emptying, and  is the amount of fuel remaining in the container. 

Will the slope of the line representing this situation have a positive, negative, or zero slope? Explain your reasoning.

A sandwich shop charges a delivery fee to bring lunch to an office building. One office pays 33 dollars for 4 turkey sandwiches including the delivery fee. Another office pays 61 dollars for 8 turkey sandwiches including the delivery fee.

1. What is the cost of one turkey sandwich? Explain your reasoning.
2. What is the delivery fee? Explain your reasoning.