Direct Variation and Proportionality

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

Is this a direct variation?
y=2x

• yes

• no

• F

• G

• H

• J

• A

• B

• C

• D

• 280

• 70

• 17.5

• 140

• 320

• 10

• 32

• 80

• A
• B
• C
• D

The value of y is directly proportional to the value of x. When x = 512 , y = 128. What is the value of y when x = 64?

Mathematical Equivalence

OFF