Direct Variation

Which graph shows a proportional relationship between x and y?

• A
• B
• C
• D

Tags

CCSS.8.EE.B.5

Write an equation for this relationship.

• y = 4x
• y = 1/8x
• y = 1/4x
• y = 8x

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.A.3

CCSS.8.F.B.4

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

• 26
• 3
• 58.5
• 2

Tags

CCSS.8.EE.C.7

CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

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

• Yes; 1/4
• Yes; 4
• Yes; 2
• No

Tags

CCSS.8.EE.B.5

CCSS.8.F.A.2

CCSS.8.F.B.4

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

• 26
• 3
• 58.5
• 2

Tags

CCSS.8.EE.C.7

CCSS.8.F.A.1

CCSS.8.F.B.4

Is this a direct variation?
y = 2x

• yes
• no

Tags

CCSS.HSF.BF.A.1

CCSS.HSF.IF.A.1

CCSS.HSF.IF.A.2

CCSS.HSF.LE.A.1

CCSS.HSF.LE.A.2

Write the equation for the table given.

• y = 1/3x
• y = 3x
• y = 1/2x

Tags

CCSS.8.EE.B.5

CCSS.8.F.A.3

CCSS.8.F.B.4

Does the relationship represent direct variation?

• Yes
• No

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.A.1

CCSS.8.F.A.3

CCSS.8.F.B.4

CCSS.8.SP.A.3

y varies directly with x. When y is 16, x is 32. Which equation represents this situation?

• y = 32x
• y = 16x
• y = 2x
• y = (1/2)x

Tags

CCSS.8.F.A.1

CCSS.8.F.B.4

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

• (0, 0)
• (1, 0)
• (0, 1)
• (1, 1)

Tags

CCSS.8.EE.B.6