Intro to Direct Variation

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

• 26
• 3
• 58.5
• 2

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x
• y=84x
• y=7/3x
• y=3/7x

 Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x
• y=100x
• y=5.25x
• y=4/21x

Which of the given graphs is a direct variation?

• A
• B
• C
• D

Is this a direct variation?

• yes
• no

Is this a direct variation?

• yes
• no

1. The table shows values x and y in a direct proportional relationship.

What will be the value of y when x is 20?

• 35

• 70

• 140

• 210

Which equation represents a direct variation situation?

• y = 3x - 1

• y = 5x

• y = 2x + 1

If y is proportional to x squared, what is the change in y if x increased by 30%

• y is decreased 96%

• y is decreased by 69%

• y is increased by 69%

• y is increased by 169%

The amount of charcoal a coal burner burns varies as the time taken for cooking. If the burner burns 600 grams in 20 minutes, how long will 1.5 kg of charcoal last?

• 50 hours

• 50 minutes

• 1/20 hours

• 45 minutes