Direct Variation

In a direct variation, y = 39 when x = 3. 
Find the value of y when x = 2.

• 26

• 3

• 58.5

• 2

y varies directly with x. When y = 39,  x = 3.  Find the value of y when x = 2.

• 26

• 3

• 58.5

• 2

Is this a direct variation?
y = 2x

• yes

• no

Write the equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

Does the relationship represent direct variation?

• Yes

• No

What is the constant of proportionality?

• 8

• 16

• 24

• 2

What ordered pair does a direct variation always go through when graphed?

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

y varies directly with x.
 y is 84 when x is 16. What is the constant of proportionality?

• y = (21/4)x

• k = 21

• k = 5.25

• k = 4/21

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4

• Yes; 4

• Yes; 2

• No