Direct Variation Sol

What does the Direct Variation Equation look like?

• Y= kx

• y = mx + b

• y = b

• y = x

Which of the following is NOT a direct variation?

• y = -2x

• y = 1/2x

• 2x + 3y = 2

• 3y = 4x

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x

• y=84x

• y=7/3x

• y=3/7x

Which situation involves a direct variation?

• As the number of miles you travel increases, the amount of gas in the tank decreases.

• As the number of hours you study increases, the grade you get on your SOL increases.

• The amount of ice in a glass decreases as the temperature increases.

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct, 12

• Inverse, 12

• Direct, 1/12

• Inverse, 1/12

Does this table of values represent a direct variation?

• Yes

• No

An equation of direct variation can be written in the form: y = kx

• True

• False

The letter k in the equation y = kx stands for

• the constant of proportionality

• king

• queen

Do x and y show direct variation?

y = 5x

• Yes

• No

The graph of a direct variation must be a straight line and must pass though

• Quadrant 1 and 3

• Quadrant 2 and 4

• the origin (0,0)