Direct variation

Write an equation for this relationship.

• y=4x

• y=1/8x

• y=1/4x

• y=8x

The amount of money earned on a job is directly proportional to the number of hours worked.  If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2

• $308

• $1.57

• $265

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

Find the unit rate:  $3.60 for 3 pounds of apples. How much does it cost for 1 pound of apples?

• $1.00 per pound

• $3.60 per pound

• $1.20 per pound

• $1.10 per pound

What is the constant of proportionality?

• 8

• 16

• 24

• 2

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

Is this a direct variation?  y =2x + 1

• Yes

• No

Is this proportional?

• yes

• no

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

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)