Direct Variation

 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

Tags

CCSS.7.EE.B.4

CCSS.7.RP.A.2

Write an equation for this relationship.

• y=4x
• y=1/8x
• y=1/4x
• y=8x

Tags

CCSS.5.OA.B.3

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

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

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

• Yes; 1/4
• Yes; 4
• Yes; 2
• No

Tags

CCSS.7.RP.A.2B

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

• 26
• 3
• 58.5
• 2

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Is this a direct variation?
y=2x

• yes
• no

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

Tags

CCSS.7.RP.A.1

CCSS.7.RP.A.2

What is the constant of proportionality?

• 8
• 16
• 24
• 2

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Which graph shows a proportional relationship between x and y?

• A
• B
• C
• D