Chapter 1.9, Problem 14P

Use the table to write an equation and answer the question.

The table shows the amount earned for washing cars. How much is earned for washing 25 cars?

To determine

To use the table to write an equation and answer the given question.

Answer to Problem 14P

  $y=4.5x$

Money earned for 25 cars is $112.5.

Explanation of Solution

Given information :

  

First we shall determine the money earned per car.

Money earned per car$=\frac{27-13.50}{6-3}=\frac{13.50}{3}=\$4.5$

Now let us assume total cost be $y$ for washing total $x$ cars.

Hence the equation shall be,

  $y=4.5x$

Now the money earned for washing 25 cars is,

Put $x=25$

  $\begin{array}{l}y=\left(4.5\right)25\\ y=112.5\end{array}$

Hence money earned for 25 cars is $112.5.