Finding the Equation of the Line

Oct 13, 2025 by wbrum.org 118 views

**The Table Shows the Profit from a School Book Fair Based on the Number of Books Sold: Profit vs. Books Sold**

Understanding the Problem

The table provided shows the profit from a school book fair based on the number of books sold. The table has two columns: "Books Sold" and "Profit". The "Books Sold" column represents the number of books sold, and the "Profit" column represents the profit made from selling those books. The table has two data points: when 100 books are sold, the profit is $50.00, and when 250 books are sold, the profit is $125.00.

Analyzing the Data

To understand the relationship between the number of books sold and the profit, we need to analyze the data. Let's start by looking at the two data points:

Books Sold	Profit
100	$50.00
250	$125.00

We can see that when the number of books sold increases from 100 to 250, the profit also increases from $50.00 to $125.00. This suggests a positive relationship between the number of books sold and the profit.

Finding the Equation of the Line

To find the equation of the line that represents the relationship between the number of books sold and the profit, we need to use the two data points. We can use the slope-intercept form of a linear equation, which is:

y = mx + b

where m is the slope and b is the y-intercept.

We can find the slope (m) by using the formula:

m = (y2 - y1) / (x2 - x1)

where (x1, y1) and (x2, y2) are the two data points.

Plugging in the values, we get:

m = ($125.00 - $50.00) / (250 - 100) m = $75.00 / 150 m = 0.50

Now that we have the slope, we can find the y-intercept (b) by using one of the data points. Let's use the first data point (100, $50.00):

$50.00 = 0.50(100) + b $50.00 = $50.00 + b b = $0.00

Now that we have the slope and the y-intercept, we can write the equation of the line:

y = 0.50x + 0.00

This equation represents the relationship between the number of books sold and the profit.

Interpreting the Results

The equation y = 0.50x + 0.00 tells us that for every additional book sold, the profit increases by $0.50. This means that the school book fair makes a profit of $0.50 for each book sold.

Conclusion

In conclusion, the table shows a positive relationship between the number of books sold and the profit. The equation y = 0.50x + 0.00 represents the relationship between the number of books sold and the profit. This equation tells us that for every additional book sold, the profit increases by $0.50.

Q&A

Q: What is the relationship between the number of books sold and the profit?

A: The table shows a positive relationship between the number of books sold and the profit. This means that as the number of books sold increases, the profit also increases.

Q: What is the equation of the line that represents the relationship between the number of books sold and the profit?

A: The equation of the line is y = 0.50x + 0.00.

Q: What does the equation y = 0.50x + 0.00 tell us?

A: The equation tells us that for every additional book sold, the profit increases by $0.50.

Q: What is the y-intercept of the equation y = 0.50x + 0.00?

A: The y-intercept is $0.00.

Q: What does the slope (m) represent?

A: The slope (m) represents the rate of change of the profit with respect to the number of books sold.

Q: How can we use the equation y = 0.50x + 0.00 to make predictions about the profit?

A: We can use the equation to make predictions about the profit by plugging in different values of x (the number of books sold) and solving for y (the profit).

Q: What are some limitations of the equation y = 0.50x + 0.00?

A: Some limitations of the equation are that it assumes a linear relationship between the number of books sold and the profit, and it does not take into account other factors that may affect the profit, such as the cost of the books or the marketing efforts.

Q: How can we extend the equation y = 0.50x + 0.00 to include other factors that may affect the profit?

A: We can extend the equation by adding additional terms to the equation to account for other factors that may affect the profit. For example, we could add a term to account for the cost of the books, or a term to account for the marketing efforts.