Tyee is working two summer jobs, making $10 per hour washing cars and $6
per hour walking dogs. Last week Tyee worked twice as many hours walking
dogs as he worked hours washing cars hours and earned a total of $88. Write
a system of equations that could be used to determine the number of hours
Tyee worked washing cars last week and the number of hours he worked
walking dogs last week. Define the variables that you use to write the system.