Direct Variation

Write the equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

What is the constant of proportionality?

• 8

• 16

• 24

• 2

Is this a direct variation?
y=2x

• yes

• no

Write an equation for this relationship.

• y=4x

• y=1/8x

• y=1/4x

• y=8x

Write an equation for this situation.

• y=9.75x

• y=19x

• y=19.25x

• y=9.5x

What is the constant of proportionality (in miles per hour) based on the table?

• 45

• 90

• 135

• 2

On a treasure map, the actual distance is directly related to the scaled distance.  If 15 miles is represented by 3 centimeters, then how many centimeters on the treasure map are equivalent to 135 miles?

• 27 cm

• 675 cm

• 529 cm

• 32 cm

The interest received on a savings account varies directly with the amount deposited. Daniel received $55.35 in interest on $1230 he deposited. How much interest would Daniel have received if he had deposited $2000 into his account?

• 34.04

• 90.00

• 1,285.35

• 44,444.44

At what rate did the rain fall?

• 2 cm per hour

• ¹/₄ cm per hour

• ¹/₂ cm per hour

• 4 cm per hour

What is the slope?

• $2/1 mile drive

• $1/2 miles driven

• 2 miles driven/$1 

• 1 mile driven/$2