Direct Variation Quiz

What is the general equation for direct variation?

• Y = X/K

• Y = KX

• Y = K + X

• Y = K - X

In Example 1, if Y = 12 when X = 4, what is the constant of variation K?

• 4

• 3

• 5

• 2

In Example 1, what is the value of Y when X = 12?

• 42

• 36

• 24

• 30

In Example 2, what is the constant of variation K when Y = -18 and X = 9?

• -2

• -3

• -4

• -1

In Example 2, what is the value of Y when X = 7?

• -18

• -12

• -14

• -16

In Example 3, if Y = 35 when X = 7, what is the constant of variation K?

• 3

• 5

• 6

• 4

In Example 3, what is the value of X when Y = 60?

• 12

• 11

• 10

• 13

In Example 4, what is the constant of variation K when Y = 1/3 and X = 12?

• 1/2

• 2/3

• 3/4

• 4/5

In Example 4, what is the value of Y when X = 9?

• 6

• 7

• 4

• 5

What method is used in Example 4 to solve for Y with fractional constants?

• Graphing

• Substitution

• Cross-multiplication

• Elimination