Problem
Amy has $20 a week to spend on coffee and cake. The price of coffee is $4 a cup, and the price of cake is $2 a slice.
If the price of cake doubles while the price of coffee remains at $4 a cup and Amy's income remains at $20, describe the change in her budget line.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.