A phone company charges a monthly rate of 
$
12.95
$12.95 and 
$
0.25
$0.25 a minute per call.
​
​The bill for 
m
m minutes is 
$
21.20
$21.20.
​Write an equation that models this situation.


To model the situation, we can create an equation based on the monthly charge and the cost per minute. 

Let $ m $ be the number of minutes used. The total bill can be represented by the equation:

\[
12.95 + 0.25m = 21.20
\]

This equation states that the fixed monthly charge ($12.95) plus the variable cost ($0.25 per minute multiplied by the number of minutes $ m $) equals the total bill ($21.20).

Do you want further details or have any questions? Here are some related questions you might consider:

1. How would you solve this equation for $ m $?
2. What is the cost if $ m = 50 $ minutes?
3. If the monthly rate increased to $15, how would the equation change?
4. How much would the total bill be if no minutes were used?
5. What is the total cost for 100 minutes?

**Tip:** Always isolate the variable to solve equations efficiently!

A phone company charges a monthly rate of $12.95 and $0.25 a minute per call. The bill for m minutes is $21.20. Write an equation that models this situation.

Explore how to model a phone bill situation using linear equations. The total bill is calculated with a monthly rate of $12.95 and a per-minute charge of $0.25, resulting in an equation of 12.95 + 0.25m = 21.20. Ideal for students in Grades 7-9.

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