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 washing cars 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.