Proportional Relationships and Direct Variation

Write the direct variation equation for this proportional relationship.

• y=0.25x

• y=5x

• y=4x

• y=100x

What makes a graph proportional?

• Linear

• The line is only in quadrant 1

• Curvy line

• Linear and the line goes through the origin

Is this a proportional relationship?

• yes

• no

Which graph is non-proportional?

• A

• B

• C

• D

Is this table proportional? If so, state the constant of proportionality.

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

Write the direct variation equation for this relationship.

At top speed, a rabbit can cover 48 miles in 2 hours. What is the direct variation equation?

• y=0.04x

• y=12x

• y=48x

• y=24x

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the direct variation equation?

• y=13x

• y=65x

• y=5x

• y=0.7x

Loretta paid $10.72 for 8 cans of cat food. What's the cost for 12 cans of cat food?

• $1.34

• $16.08

• $17.42

• $12.23

You need 2 yards of fabric to cover 3 pillows and 6 yards to cover 9 pillows. How much fabric do you need to cover 15 pillows?

• 10 yards

• 22.5 yards

• 8 yards