Question

Juan is a software salesman. His monthly salary is $1900 plus an additional $90 for every copy of “math is fun he sells”. Let S represent his total salary this month (in dollars), and let N represent the number of copies of “math is fun he sells”. Write an equation relating S to N, and then graph your equation using the axes below.

Answer 1

This is a simple question to solve.

First, let's write our equation:

As we can see above, the total salary (S) is equal to the monthly salary (U$ 1900) plus an additional and this additional is described as the amount of U$ 90 times the number of copies (N). Once we have our equation relation S and N (that means S depends on the value of N) to graph our equation we can try to figure some values for S given different Ns. Let's draw a table to illustrate better:

We could continue our calculation for every possible N, but we just need a few points to figure out how to graph our equation. So let's use these 4 points and graph below:

The graph above represents our equation properly remembering it is not in scale.

And that is how we can solve our question.