To analyze the model given, we have the equation for Adam's annual salary:
\[ y = 0.28x + 38,000 \]
1. What is the y-intercept?
The y-intercept of the equation is the value of \( y \) when \( x = 0 \). In this equation, the y-intercept is 38,000.
2. What does the y-intercept mean in context?
In the context of Adam's salary model, the y-intercept (38,000) represents his base salary. This is the amount he earns regardless of his sales. So even if his total sales \( x \) is zero (meaning no sales were made), he still earns $38,000 as his base salary.
3. What is the slope?
The slope of the equation is 0.28.
4. What does the slope mean in context?
In this context, the slope (0.28) represents the commission rate that Adam earns for his sales. For every additional dollar of sales that Adam makes, his total annual salary increases by $0.28. Thus, the slope indicates how much Adam's earnings increase due to additional sales.
5. If Adam made $45,000 total annual salary, how much was his total sales?
To find \( x \) when \( y = 45,000 \), we can set up the equation:
\[ 45,000 = 0.28x + 38,000 \]
Now, subtract 38,000 from both sides to isolate the term with \( x \):
\[ 45,000 - 38,000 = 0.28x \]
\[ 7,000 = 0.28x \]
Next, divide both sides by 0.28 to solve for \( x \):
\[ x = \frac{7,000}{0.28} \]
Calculating this gives:
\[ x \approx 25,000 \]
Therefore, if Adam made $45,000 in total annual salary, his total sales were approximately $25,000.