8 18. MONEY You and a friend both work two different jobs. The system
of linear equations represents the total earnings for x hours worked
at the first job and y hours worked at the second job. Your friend
earns twice as much as you.
a. One week, both of you work 4 hours at the first job. How
many hours do you and your friend work at the second job?
b. Both of you work the same number of hours at the second job.
Compare the number of hours you each work at the first job.