Register
The monthly cost for 50 minutes of calls is $14.01 and the monthly cost for 79 minutes is $17.78. What is the monthly cost for 73 minutes of calls?
47.5k views
5 votes
The monthly cost for 50 minutes of calls is $14.01 and the monthly cost for 79 minutes is $17.78. What is the monthly cost for 73 minutes of calls?

User Gaurav Shah
by
7.8k points

1 Answer

5 votes

\bf \begin{array}{lllll} &x_1&y_1&x_2&y_2\\ % (a,b) &({{ 50}}\quad ,&{{ 14.01}})\quad % (c,d) &({{ 79}}\quad ,&{{ 17.78}}) \end{array} \\\quad \\\\ % slope = m slope = {{ m}}= \cfrac{rise}{run} \implies \cfrac{{{ y_2}}-{{ y_1}}}{{{ x_2}}-{{ x_1}}} \\ \quad \\\\ % point-slope intercept y-{{ y_1}}={{ m}}(x-{{ x_1}})\qquad \textit{plug in the values and solve for

find the slope, or "rate of change", then plug those values in the
point-slope form and solve for "y", to get the equation of that line,

how much is it for 73 minutes? well, make x = 73, and to get "y" :)
User Fabian Winkler
by
8.6k points
← Prev Question Next Question →

No related questions found

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Link Copied!