Direct Variation Test

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

• 26

• 3

• 58.5

• 2

Write the equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

Is this table proportional?

• Yes

• No

Identify the Constant of Proportionality and Write an Equation for the Graph

• y=1/10x

• y=10x

Identify the constant of proportionality from the graph and write an equation.

• y=5x

• y=1/5x

y varies directly with x, and 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

What is the constant of proportionality?

• 8

• 16

• 24

• 2

Is this proportional?
y=2x

• yes

• no

Trina's paycheck earnings varies directly as the number of hours she works. If she works 19 hours and earns $187.15, what should she earn if she worked 40 hours?

• $394

• $440

• $472.80

• $512.20