Writing Linear Functions

To prepare for a recent road trip, Jill filled up her 19-gallon tank. She estimates that her SUV will use about three gallons per hour. Write an equation to model the amount of gasoline, G, remaining in her tank after t hours.

The temperature outside is currently 68°F and falling at a steady rate of 4 degrees every hour. Write a linear equation that relates the Fahrenheit temperature, F, to the time in hours, t, it has been falling.

Jen charges $7.50 for every hour, h, she babysits. Write a function, f(h), to represent the total amount Jen would make babysitting h, hours.

Andy has $310 in his account. Each week, w, he withdraws $30 for his expenses. Write a linear equation to represent the scenario.

Connor wants to attend the town carnival. The price of admission to the carnival is $4.50, and each ride costs an additional 79 cents. Which table is the correct representation for this scenario?

A cell phone company charges $60.00 a month for up to 1 gigabyte of data. The cost of additional data is $0.05 per megabyte. If d represents the number of additional megabytes used and c represents the total charges at the end of the month, write a linear equation to determine a user's monthly bill?

Kyle is starting an exercise program. The FIRST day he will spend 28 minutes on a treadmill. He will increase his time on the treadmill by 4 minutes each day. Write an equation for T(d), the time, in minutes, on the treadmill on day d.

Mr. Cook is saving money in an account. At the beginning of the year, he has $56 in savings and puts in another $4 per week. Write a function f(x) that models the total amount in the savings account after x, weeks.

This graph shows the increase in oven temperature over time (minutes).

What is the meaning of the y-intercept?