Direct Variation

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

• 26
• 3
• 58.5
• 2

Is this a direct variation?
y=2x

• yes
• no

Which of the given graphs is a direct variation?

• A
• B
• C
• D

Is this proportional?

• yes
• no

Is this proportional?
y = 7x + 3

• yes
• no

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

If x and y vary directly, what is the missing value in the points (x, 4) and (-14, -8)?

• x = -7
• x = -2.3
• x = 2.3
• x = 7

If y = 15 when x = 12 find y when x = 32.

• y = (5/4)x; 40
• y= (4/5)x; -40
• y= 4x; 5
• y= 5x; -5

If y =4 when x = -4, find y when x =7.

• y= x, 7
• y= -x; 7
• y = -x; -7
• y= x; -7

if y is directly proportional to x, y is 10 when x is 3. What is the value of y when x is 5?

• 16 2/3
• 1.5
• 6
• 12