Direct Proportion Equation

Which of the following shows the direct proportion equation?

• y = kx

• xy = k

• x = ky

• x² = k

Identify if the equation represents a direct proportion. If so, identify the constant of proportionality.

• yes; 1/3

• no

• yes; 3

Identify if the equation represents a direct proportion. If so, identify the constant of proportionality.

• yes; 20

• yes; 4/5

• no

• yes; 5/4

Identify if the equation represents a direct proportion. If so, identify the constant of proportionality.

s = 5t

• no

• yes; 5

• yes; 1/5

• yes; t

Does this equation represent a proportional relationship?

• Yes

• No

Tags

NC.7.RP.2

NC.7.RP.2.c

Proportional or Not Proportional?

• Proportional

• Not Proportional

Is this a proportional equation?  Why?

• It is not proportional because it doesn't have a constant.

• It is not proportional because it doesn't have a constant rate of change.

• It is proportional because if x = 0, y = 0.

• It is proportional because it has a y intercept of 22.

Which equation shows a proportional relationship between x and y? (a)  

• y = 3x + 9

• y = 1/2x

• y = 1/2x - 2

• y = x2

Identify if the equation represents a direct proportion. If so, identify the constant of proportionality.

2y = ¹/₅x

• yes; 10

• yes; 2/5

• yes; 1/10

• no

What is the constant of proportionality?

• 8

• 2

• 3