Chapter 1.9, Problem 5STP

For Exercises $1-5,$ choose the correct letter.

Sally is 3 years younger than Ralph. Which equation represents this relationship?

A. $R=3S$

B. $R=S-3$

C. $S=R+3$

D. $S=R-3$

To determine

To choose: The option for the number of products have to sell if company wants a revenue $\$3705$ .

Explanation of Solution

Given:

The equation for the revenue generated through sales is $y=45x-120$ where $x$ is the number of products sold and $y$ is the revenue.

It is given that the equation for the revenue generated through sales is $y=45x-120$ where $x$ is the number of products sold and $y$ is the revenue.

The company wants to make a revenue of $\$3705$ and there is need to find the number of products sold.

Substitute 3705 for $y$ in the equation $y=45x-120$ to obtain the value of $x$ .

$\begin{array}{c}3705=45x-120\\ 3705+120=45x\\ 3825=45x\\ x=\frac{3825}{45}\\ x=85\end{array}$

Therefore, the value of $x=85$ that means company need to sell 85 products.

Thus, option G 85 is correct.