Writing Functions: Lesson 1 Worksheet: Using Slope and y-intercept.

Directions: Label the four parts. Then write the equation in slope intercept form. Answer any further questions using the extra information given, if necessary.

A jet-ski rental costs $5 to rent a life-jacket. They also charge $30 per hour that you use the jet-ski. Write a linear model for the cost in terms of the number of hours you ride the jet-ski.

Independent:

Dependent:

Rate of change:

Initial Value:

Equation:

In 2010 East Middle had 800 students. Each year the enrollment declined by 10 students. Write a linear model to determine the total number of students in terms of years since 2010.

Independent:

Dependent:

Rate of change:

Initial Value:

Equation:

How many students would you expect to be enrolled at East Middle in 2015? (Hint: how many years passed between 2010 and 2015?)

A cell phone company charges $15 for the phone plan. However, they also charge $5 for every Gig of data used (they don’t offer unlimited!) Write a linear model to determine the cost in terms of the number of Gigs of data used.

Independent:

Dependent:

Rate of change:

Initial Value:

Equation:

How much would my phone bill total, if I used 7 Gigs of data this past month?