You and a friend both work two different jobs. the system of linear equations represents the total earnings for x hours worked at the fi earns twice as much as you.
a. one week, both of you work 4 hours at the fi rst job and y hours worked at the second job. your friend rst job. how many hours do you and your friend work at the second job?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling