https://r2.erweima.ai/mathbot/image/17266865373839xxc1w6e.jpg

Let's break down the problem step by step to find the equation and graph it.

### Given:
- Henry's base monthly salary = \$1800
- He earns an additional \$60 for each copy of **Math is Fun** he sells.

Let:
- $ S $ represent Henry's total salary in a month (in dollars).
- $ N $ represent the number of copies of **Math is Fun** sold.

### Step 1: Formulating the Equation
The total salary $ S $ is the sum of his base salary and his earnings from selling copies. Thus, the equation relating $ S $ to $ N $ can be written as:

\[
S = 1800 + 60N
\]

This is a linear equation where:
- The base salary is \$1800 (y-intercept).
- The rate of increase per unit (slope) is \$60 for each additional copy sold.

### Step 2: Graphing the Equation
In this case:
- $ N $ is the independent variable (horizontal axis).
- $ S $ is the dependent variable (vertical axis).

Would you like help visualizing this graph and any further details on how this equation was formed?

Here are some related questions that expand the topic:
1. What happens to Henry's salary if he sells zero copies of **Math is Fun**?
2. How would the equation change if he earned \$70 per copy instead of \$60?
3. What does the slope of this equation represent in real-world terms?
4. How would the graph look if his base salary was reduced to \$1500?
5. How can we calculate the number of copies needed for Henry to reach a specific salary?

**Tip**: The slope of a line in a salary equation represents the earnings per additional unit sold!

Henry is a software salesman. His monthly salary is $1800 plus an additional $60 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.

Learn how to calculate Henry's monthly salary based on a linear equation S = 1800 + 60N, where Henry earns a base salary of $1800 and $60 for each sale. Suitable for middle school students (Grades 6-8) covering algebra and linear relationships.

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