Proportional and Additive

• y = 1/5x

• y = 5x

• y = 1/2x

Write the equation of the proportional relationship using the format y = kx.

What is the constant of proportionality? Use the format k = 2.

Write the equation of the graph. Use the format y = kx.

Is the graph proportional?

• Yes

• No

Newtown middle school spends 11 dollars on every yearbook it buys. Is the amount of money NMS spends on yearbooks proportional to the total number of yearbooks NMS buys?

• Yes

• No

What is the constant of proportionality?

• k = 3

• k = 1/3

• k = 3x

• k = 1/3x

Write an equation for the relationship between x and y. Use format y = kx.

• Proportional, the rate of change is 5/3
• Non Proportional
• Proportional, the rate of change is 3/5
• Proportional, you add 2

Does the table show a proportional relationship?

• Yes

• No