Name______Date______Bell ______

Investigation 2.4

Moving Straight Ahead

Directions: Use the pledge plans at the top of page 30 to answer the following questions.

Part I

1. Explain in sentence form what information the equation is telling you about each pledge plan? Does the plan make sense for a walkathon?

Plan 1 -

Plan 2 -

Plan 3 -

2 Make a table for values of x from -5 to 5.

x / y

Plan 1 Plan 2 Plan 3

x / y
x / y

3. Sketch a graph. To the side of each graph explain if the y-values increase, decrease, or stay the same as the x-values increase? Use the graphs on the next page.

Part II: Answer the following questions using the information from Part I.

1. Which graph from Part I can be traced to locate point (2, 4)?

2. What do the coordinates (2, 4) mean in relation to the equation?

3. Which equation has a graph you can trace to find the value of x that makes 8 = 5x - 3 a true statement?

4. How does finding the value of x in 8 = 5x – 3 help you find the exact coordinates for a point on the line of the equation? What are the exact (x, y) coordinates?

5. The following three points all lie on the graph of the same plan:

(-7, 13) (1.2, y) (x, -4)

a) For what plan are these coordinates going to fit on the graph?

b) Two of the points have a missing coordinate. Find the missing coordinate using the table, graph or equation of the plan.