Direct Variation

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

• Yes; 1/3
• Yes; 3
• Yes; 5
• No

Given (3, 4) and (12, y) are part of the same direct variation. Find y.

• 16
• 9
• 45
• 32

Given (3, 21) and (x, 42) are part of the same direct variation. Find x.

• 3
• 6
• 9
• 12

Tags

CCSS.HSF-LE.A.1B

For direct variation, you ______.

• Add
• Subtract
• Multiply
• Divide

Write an equation for this relationship.

• y=4x
• y=1/8x
• y=1/4x
• y=8x

Tags

CCSS.6.EE.C.9

Eduardo counted ten seconds between seeing lightning and hearing thunder, and he knew that the lightning was about 2 miles away. What is the equation of variation? (hint, time is always x)

• y = 10x

• y = 2x

• y = 5x

• y = 1/5x

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the equation of variation?

• y = 123x
• y = 20x
• y = 6.15x
• y = 0.16x

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

• 26
• 3
• 58.5
• 2