9.18 Direct Variation

Math Response

(7 min) A car wash tracks the number of gallons of soap they used each month. How many gallons of soap does the car wash use per month? (Activity Sheet)

Type answer here

Correct Answer: 15

Deg^°

Rad

Math Response

(3 min) Lap 1: Mr. Simmons gave his students a linear function where y varies directly with x. What is the constant of variation?

Type answer here

Correct Answer: -\frac{2}{3}

Deg^°

Rad

Multiple Choice

(5 min) Lap 2: The value of y varies directly with x. When y = −78, x = 6. What is the value of y, when x = 11?

• $$143$$

• $$-156$$

• $$-143$$

• $$-71$$

Multiple Select

(5 min) Annotate: A group of track athletes tracks the amount of sports drink they consume based on the number of minutes they practice. If the ounces consumed varies directly with the number of minutes, which two athletes reflect the same relationship? (activity sheet)

• Ralph

  9 ounces in 12 min

• Billy

  8 ounces in 6 min

• Joey

  10.2 ounces in 17 min

• Travis

  21 ounces in 28 min

Multiple Choice

(5 min) Annotate: Lap 3: A chef records how much rice is used to make paella. The number of servings vary directly with the number of cups of rice are used. If the chef wants to make 42 servings, how many cups of rice will be needed? 

(activity sheet)

• $$7$$

• $$6$$

• $$12$$

• $$9.5$$

Drag and Drop

(4 min) If y varies directly with x, and you’re given the point (−4, −40), what is the value of x when y = 23? (activity sheet)



The k value is ​ ​

Placeholder

and the value of x when y = 23 is ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

10

230

-10

-230

0.10

2.3