Answer:
$7
Step-by-step explanation: Five step plan
1. How much is each hamburger?
Variables
Price paid : $50
Change: $22
No. of hamburgers: 4
2. Price for all hamburgers. 50-22 = 28
3. y(price of each hamburger) = 28/4
4. y = 7
5. The price of each hamburger is 7