Direct Variation

What does the Direct Variation Equation look like?

• Y= kx

• y = mx + b

• y = b

• y = x

Is this a direct variation?

• yes

• no

What ordered pair does a direct variation always go through when graphed?

• (0, 0)

• (1, 0)

• (0, 1)

• (1, 1)

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

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

Which of the given graphs is a direct variation?

• A

• B

• C

• D

 y varies directly with x, and y is 16 when x is 32. Which equation represents this situation?

• y=32x

• y=16x

• y=2x

• y=(1/2)x

Is this a direct variation?

• yes

• no

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

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