You and your sister work on the weekends at your parents’ store. You receive $4 per hour and your sister gets $5 per hour. On Saturday both of you worked a total of 7 h and together made $32. How much money did each of you earn on Saturday?
If you worked x hours, then sister worked 7-x hours. So, now you just have to solve
4x + 5(7-x) = 32
Plug and chug.