Problema Solution
Salma works as a tutor for $13 an hour and as a waitress for $15 an hour. This month, she worked a combined total of $107 hours at her two jobs.
Let t be the number of hours Salma worked as a tutor this month. Write an expression for the combined total dollar amount she earned this month.
Answer provided by our tutors
Let t be the number of hours Salma worked as a tutor this month.
Let w be the number of hours Salma worked as a waiters this month.
This month, she worked a combined total of 107 hours at her two jobs:
t + w = 107 => w = 107 - t
thus the expression for the combined total dollar amount will be
13t + 15w = 13t + 15*(107 - t) = 13t + 1605 - 15t = 1605 - 2t