Direct & Inverse Variation

Which represents the equation of a direct variation?

• y = mx + b

• y = k/x

• y = kx

• y = x

Which represents the equation of an inverse variation?

• y = mx + b

• y = x

• y = kx

• y = k/x

Which point does a direct variation always pass through?

• (0,0)

• (1,1)

• (0,5)

• None

What type of variation is represented by the graph?

• direct

• inverse

• neither

What type of variation is shown in the graph?

• direct

• inverse

• neither

What type of variation is represented by the graph?

• direct

• inverse

• neither

What type of variation is shown in the graph?

• direct

• inverse

• neither

If y varies directly as x, and x = 9 when y = 15, find y when x = 33.

• 27

• 20

• 55

• 4

Is the following equation a direct variation? If so, what is k?

y + 8 = -x

• no

• yes; -1

• yes; 8

• yes; -8

Is the following equation a direct variation? If so, what is k?

-4 + 7x + 4 = 3y

• no

• yes; 7

• yes; 4

• yes; 7/3