Solving Direct Variation Equations

What is the formula for a direct variation equation?

• y = x^2

• y = mx + b

• y = kx

• y = k/x

In the first problem, what is the value of k when y = 9 and x = -3?

• -3

• -9

• 3

• 9

In the first problem, what is the value of x when y = 15?

• -3

• 3

• -5

• 5

In the second problem, what is the simplified value of k when y = 15 and x = 12?

• 1.5

• 4/5

• 1.25

• 5/4

In the second problem, what is the value of y when x = 32?

• 30

• 35

• 40

• 45

In the third problem, what is the value of k when y = -11 and x = 6?

• -11/6

• 6/11

• 11/6

• -6/11

In the third problem, what is the value of x when y = 3?

• 11/18

• -18/11

• -11/18

• 18/11

In the fourth problem, what is the value of k when y = 0.5 and x = 4?

• 0.125

• 0.75

• 0.25

• 0.5

In the fourth problem, what is the value of y when x = -3?

• -0.5

• -0.125

• -0.25

• -0.375

What should you do if you need help graphing direct variation equations?

• Read a book

• Ask a friend

• Ignore it

• Watch a different video