Direct Variation Equation

What is the constant rate of proportionality?

Tags

CCSS.7.RP.A.2B

What is the constant of proportionality? 

Tags

CCSS.7.RP.A.2B

 What is the direct variation equation? 

Do the following ordered pairs represent a proportional relationship:  (2, 3), (4, 6), (6, 9), (8, 12)

 Explain why or why not.  If yes, what is the constant of proportionality/constant of variation?

Tags

CCSS.7.RP.A.2B

Does the following equation represent a direct variation:  y = 5 + x    Explain why or why not.

A square with side length n is shown below.  Which equation represents the proportional relationship between perimeter and side length?

• n = 4P

• P = 4 + n

• P = 4n

Tags

CCSS.7.RP.A.2C

Assume y varies directly with x, write an equation for the direct variation. Then find the value of the variable asked for.

If y = -4 when x = 10, find y when x = 5.

Assume y varies directly with x, write an equation for the direct variation. Then find the value of the variable asked for.

If y = 12 when x = -15, find y when x = 2.

Assume y varies directly with x, write an equation for the direct variation. Then find the value of the variable asked for. Find x when y = 18, if y = 9 when x = 8.

What ordered pair represents the unit rate? 

Tags

CCSS.8.EE.B.5