Relations and Functions

Question 1

Based on the graph shown to the right, whose phone cost varies directly with the amount of time spent talking?

Revolt · Accepted Answer

Nikiya’s only

Question 2

Mark’s cost does not vary directly with time spent talking because

Revolt · Accepted Answer

the cost of 0 hours is not 0 dollars

Question 3

The ratios

Revolt · Accepted Answer

are not constant;

Question 4

therefore, the points in the table form a direct variation.

Revolt · Accepted Answer

do not

Question 5

X faster✔ slowerconstant

Revolt · Accepted Answer

✔ slower

Question 6

What are the coordinates for the end of the interval?

Revolt · Accepted Answer

(9, 4)

Question 7

which represents Nikiya’s

Revolt · Accepted Answer

cost per hour

Question 8

For this function, the average rate of change as x increases.

Revolt · Accepted Answer

increases

Relations and Functions Answers