Constant Rate of Change and Proportionality

Is this graph proportional?

• Yes

• No

What makes a graph proportional?

• Straight line

• The line goes through the origin

• Curvy line

• Straight line and the line goes through the origin

Does this table show a proportional relationship?

• Yes

• No

40 CALORIES PER MIN.

15 CALORIES PER MIN.

4 CALORIES PER MIN.

60 CALORIES PER MIN.

• 40 CALORIES PER MIN.

• 15 CALORIES PER MIN.

• 4 CALORIES PER MIN.

• 60 CALORIES PER MIN.

• 9 players per team
• 12 players per team
• 10 players per team
• 11 players per team

The table shows the cost of long distance calls based on the number of minutes used. Is there a constant rate of change, and if so what is it?

• Yes, 10 calls per minute

• Yes, $.10 per minute

• Yes, $.40 per minute

• Not a constant rate

What is the constant of proportionality for this table?

• 1/9

• 9

• 8

What is the rate of change for the following graph?

• 80

• 20

• 40

• 160

Formulate the equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

In the equation y = 14x, what is the constant of proportionality?

• y

• x

• 14