Question

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

A.) Mark’s only
B.) Nikiya’s only
C.) Both Mark’s and Nikiya’s

Answer 1

Answer:

B. Nikiya's only

Step-by-step explanation:

Mark’s cost does not vary directly with time spent talking because the cost of 0 hours is not 0 dollars

For Nikiya’s plan, the value of the constant of variation is 15

which represents Nikiya’s cost per hour

Answer 2

Nikiya’s only phones cost varies directly with the amount of time spent.

The correct answer is option B.

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

Nikiya’s only

Mark’s cost does not vary directly with time spent talking because the cost of 0 hours is not 0 dollars.

For Nikiya’s plan, the value of the constant of variation is 15

which represents Nikiya’s taking cost `15 dollar per hour.

$slope=\frac{30-0}{2-0} =15$ dollar per hour

Therefore, Nikiya’s only phones cost varies directly with the amount of time spent.

For more information:

https://brainly.com/question/21606425