On Naomi's cell phone plan, the amount she pays each month for international text messages is proportional to the number of international texts she sends that month. Last month, she paid $3.20 for 16 international texts.

A. What is the constant of proportionality in this proportional relationship?

B. Write an equation to represent this proportional relationship. Make sure to define the variables you use.

Question

Margaret Pittman

Mathematics

9 June, 20:40

On Naomi's cell phone plan, the amount she pays each month for international text messages is proportional to the number of international texts she sends that month. Last month, she paid $3.20 for 16 international texts.

A. What is the constant of proportionality in this proportional relationship?

B. Write an equation to represent this proportional relationship. Make sure to define the variables you use.

+4

Answers (1)

Know the Answer?

Marley Flynn · Answer 1

This is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

Plug in the 3.20 and the 16 to solve for the "k". This is the constant of proportionality. It is the value that will not change.

3.20 = k (16). Solving you get $.20 per text.

The equation would then be y =.20x