Parry Computers leases space in a mall at a monthly rental cost of $3,000. The following graph setups depict rental cost on the vertical axes and activity level on the horizontal axes:
Total monthly rental cost Rental cost per computer

Number of computers sold Number of computers sold
Required
a. Draw a line that depicts the relationship between the total monthly rental cost and the number of computers sold.
b. Draw a line that depicts the relationship between rental cost per computer and the number of computers sold.