DIRECT VARIATION

In the equation y=kx, k is called the ______.

• Independent Variable

• Dependent Variable

• Constant of Variation

• Statement of Variation

" y varies proportionally as x"

This is an example of

• Equation of Variation

• Variation Statement

• Dependent Variable

• Independent Variable

Is this a direct variation?

• YES

• NO

Is this a direct variation?

• YES

• NO

Is this a direct variation?

• YES

• NO

What is the constant of variation in the equation, y = 3 (x+z) ?

• y

• 3

• x

• z

Are all linear equations direct variations?

• Yes, because they all linear equations have constant of variations.

• Yes, because all linear equations create a straight line.

• No, because not all linear equations pass through the origin.

• No, because linear equations does not contain any constant of variation.

If y varies directly as x and y = 18 when x = 3, Find y when x = 7.

• 16

• 34

• 42

• 49

Using the standard formula of direct variation, find x if k=2 and y=4.

• 8

• 1/2

• 4

• 2

What is the constant of proportionality based on the table if y varies directly as x?

• 5

• 3/4

• 1/3

• 3