While installing a sprinkler system, ethel wants to cut a 20-foot length of plastic tubing into two pieces. the longer piece is to be 2 feet longer than twice the shorter piece. find the length of each piece.

2x minus y equals 6, x plus y equals negative 3

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?

How can constraints be used to model a real-world situation?