Draw a graph of Marcs budget line with the quantity of DVDs on the x-axis. What is

Question:

Draw a graph of Marc’s budget line with the quantity of DVDs on the x-axis. What is the slope of Marc’s budget line? What determines its value?
Marc has a budget of $20 a month to spend on root beer and DVDs. The price of root beer is $5 a bottle, and the price of a DVD is $10.