Proportion Equations and Direct Variation

A relationship between two quantities in which of the ratio of one quantity to the other quantity is constant.

• Ordered Pair

• System of Equations

• Proportional Relationship

• Y-Intercept

Proportional or Nonproportional?

• Proportional

• Nonproportional

Is the given table a direct variation? If so, what is the constant?

• No, it's not a direct variation

Determine if the given equation is a direct variation, an inverse variation, or neither.

• Direct Variation

• Inverse Variation

• Neither

Determine if the table represents a direct variation.

(Hint: Find k, the k values must match)

• Direct Variation

• Not a Direct Variation

Which of these is a Direct Variation Equation?

• y = 1

• y = 3x

• x = 2

• y = x + 3

What is the equation for Direct Variation?

• y= kx

• y=k/x

• y=mx+b

• y=x/k

Which three ordered pairs would represent a direct variation?

(3, 15) (0, 0) (20, 20)

(4, 5) (1, 20) (2, 10)

• (3, 15)

  (0, 0)

  (20, 20)

• (4, 5)

  (1, 20)

  (2, 10)

• (0, 0)

  (4, 5)

  (3, 15)

• (0, 0)

  (2, 10)

  (3, 15)

Is the given table a direct variation? If so, what is the constant?

(Required: Show your work by hand to prove or disprove your answer!)

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

The amount of wrapping paper needed to wrap a box varies __?___ with the size of the box.

• neither directly nor inversely

• both directly and inversely

• directly

• inversely