Sara is a librarian and works at least 10 hours per week. If Sara would like to work extra shifts, they are added to her

schedule in two-hour increments. Which equation models the number of hours that Sara will work at the library this

week? Assume x is the number of two-hour increments and y is the total number of hours worked.

y = 10 + 2x

or

y = 2x + 10

Step-by-step explanation:

She works a fixed 10 hours each week, so we start with

y = 10

Now she adds 2-hour increments. She can have 0, 1, 2, or another number of increments. x represents the number of increments. Since each increment is 2 hours, 2x represents the number of hours added by the increments. Now we add 2x to the fixed number of hours.

y = 10 + 2x

or

y = 2x + 10