Review 5.5­5.7
1. What is the y­intercept of the graph shown?
y
7
6
5
4
3
2
1
­7 ­6 ­5 ­4 ­3 ­2 ­1 0
­1
x
1
2
3
4
5
6
7
­2
­3
­4
­5
­6
­7
2. Graph y = 2x ­ 3. What is the y­intercept?
y
7
6
5
4
3
2
1
­7 ­6 ­5 ­4 ­3 ­2 ­1 0
­1
­2
­3
­4
­5
­6
­7
x
1
2
3
4
5
6
7
3. A cell phone company charges a $40 startup fee and then $0.25 for every minute used. The equation y = 0.25x + 40 models the situation. Graph the equation and find the y­intercept.
4. The graph represents the increase of the sales of pineapple juice. Write an equation for the line in slope­
intercept form to represent this situation.
5. The line models the depth of the water in a small fountain during a severe rainstorm. What is the y­
intercept? What does the y­intercept represent? What is the slope of the line? What does the slope represent?
6. The line model's Jack's savings account. He started with $11 in his account. He saves $2 each day. Write an equation for the line in slope­intercept form where x is the number of days he saves and y is the total amount in his account.
7. Graph the equation y = 2x ­ 4.
3
y
7
6
5
4
3
2
1
­7 ­6 ­5 ­4 ­3 ­2 ­1 0
­1
x
1
2
3
4
5
6
7
­2
­3
­4
­5
­6
­7
8. Samantha, Caitlin, and Sam are trying to see who runs the fastest. Samantha says she can run 6 miles every hour. The table to the right shows the relationship between total miles Caitlin ran and time. The following graph shows the relationship for Sam. Who runs the fastest? 9. A family went to a baseball game. They parked the car in a parking lot which charged $20. The cost per ticket was $24. Write an equation for the total cost of going to the baseball game, where y is the total cost and x is the total number of people. If the family spent $164, how many people went to the game?