Direct Indirect Variations

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x

• y=100x

• y=5.25x

• y=4/21x

If y = 15 when x = 12 find y when x = 32.

• y = (5/4)x; 40

• y= (4/5)x; -40

• y= 4x; 5

• y= 5x; -5

If y =4 when x = -4, find y when x =7.

• y= x, 7

• y= -x; 7

• y = -x; -7

• y= x; -7

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the constant of variation?

• k = 13

• k = 65

• k = 5

• k = 1/13

Is this proportional?
y=2x

• yes

• no

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

• True

• False

Does this table of values represent a direct variation?

• Yes

• No

Suppose y varies directly as x. If x = 27 when y = 6, find x when y = 2.

• 0.44

• 81

• 23

• 9

Suppose y varies directly as x. If x = 24 when y = 8, find y when x = 33.

• -1

• 5.8

• 11

• 99