How to check your homework that involves graphing.

Locate the x-intercept and the y-intercept on your graph to see if it matches the answer key.

30. y = x + 2 32. y = x – 4 34. y = -2x + 2

36. x + y = 1 38. 2x + y = 5 40. x = 2

The equation y = 0.62x describes the approximate number of miles y in x kilometers.

1. Describe what the solution (8, 4.96) means.

2. About how many miles is a 10-kilometer race?

3. Mr. Fish is running a half-marathon (13.1 miles) this spring. How many kilometers would that be?

During a workout, a target heart rate y in beats per minute is represented by y = 0.7(220 – x),

where x is a persons age.

1. Compare target heart rates for a 20 year old and a 50 year old.

2. What would your target heart rate be?

Section 8.3

Graphing Linear Equations Using Intercepts

State the x-intercept and the y-intercept of the line.

Find the x-intercept and the y-intercept for the graph of:

4y = -3x + 24

y = 4x

Home Repair Renata Jones has $300 for home repairs. A plumber charges her $50 an hour. The equation y = -50x + 300 represents the amount of money left in her budget after x number of plumbing hours.

Use the intercepts to graph the equation.

Shopping Suzanne has $125 to spend on new shoes. The shoe store is having a sale in which every pair of shoes is priced at $25. The equation y = -25x +125 represents the amount of money Suzanne has left after purchasing x pairs of shoes.

Use the intercepts to graph the equation.

Homework

Practice 8.3