Direct Variation

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

• y = 40

• y= -40

• y= 25.6

• y= 5.625

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

• y= -2.2

• y= 7

• y = -7

• y= -28

What does the Direct Variation Equation look like?

• Y= kx
• y = mx + b
• y = b
• y = x

If y vaires directly with x and y= 12 when x= 15. What is the value of x when y= 16?

• 12.8
• 20
• 11.25
• 19

Is this a direct variation?

• yes
• no

Is this a direct variation?

• yes
• no

Which graph shows a proportional relationship between x and y?

• A
• B
• C
• D

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

• (0, 0)
• (1, 0)
• (0, 1)
• (1, 1)

Which graph shows a proportional relationship between x and y?

• A
• B
• C
• D

The amount of money earned on a job is directly proportional to the number of hours worked.  If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2
• $308
• $1.57
• $265