Roger's Electronics sells a variety of computers and other electronic devices. During the month of July, Roger's sold the following numbers of computers: Dates Total Computers Sold
July 1-4 68
July 1-12 204

Part A:
Assuming that the proportional relationship between computers sold and days continues, write an equation that shows the amount of computers (y) sold per day (x) in July.

Part B:
How many computers were sold during the entire month of July (31 days long)?