Susan works as a tutor for $14 an hour and as a waitress for $13 an hour. This month, she worked a c

Susan works as a tutor for $14 an hour and as a waitress for $13 an hour. This month, she worked a combined total of 104 hours at her two jobs. Let t be the number of hours Susan worked as a tutor this month. Write an expression for the combined total dollar amount she earned this month.

Let t be the number of hours for math tutoring and w be the number of hours for waitressing. We're given:

1. t + w = 104
2. 14t + 13w = D <-- Combined total dollar amount