Sarah works two jobs over the summer. She is a waitress, earning $11 per hour, and she is also a babysitter for three kids, earning $18 per hour. Sarah currently waitresses 16 hours and babysits 3 hours a week. She would like to increase her babysitting hours and decrease her waitressing hours by the same number of hours. Write an expression to represent how this change would affect her weekly income.

HELP PLZ