Math Problem Statement

What is the equation of the trend line in the scatter plot?

Solution

To determine the equation of the trend line from the scatter plot, we can use the two blue points provided.

  1. First, I need to identify the coordinates of the blue points.

  2. Then, I will use the slope formula:

    m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

    where (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) are the coordinates of the two blue points.

  3. After calculating the slope, I will use the slope-intercept form of the equation of a line:

    y=mx+by = mx + b where mm is the slope and bb is the y-intercept.

Let me first identify the two blue points and then calculate the slope and y-intercept. matplotlib import pyplot as plt import matplotlib.image as mpimg

Load and display the image

img_path = '/mnt/data/1738203619988fefc3gma.jpg' img = mpimg.imread(img_path)

Display the image to analyze it

plt.imshow(img) plt.axis('off') # Hide axes for better visual plt.show()Based on the image, the two blue points on the scatter plot appear to be at the coordinates:

  • Point 1: (4,2)(4, 2)
  • Point 2: (7,6)(7, 6)

To find the equation of the trend line, we will calculate the slope using the formula:

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

Substituting the coordinates (x1,y1)=(4,2)(x_1, y_1) = (4, 2) and (x2,y2)=(7,6)(x_2, y_2) = (7, 6), we can now compute the slope.

Let me calculate it for you. Coordinates of the blue points x1, y1 = 4, 2 x2, y2 = 7, 6

Calculate the slope

m = (y2 - y1) / (x2 - x1) mThe slope of the trend line is approximately m=43m = \frac{4}{3}.

Now, to find the y-intercept bb, we can use the point-slope form of the equation of a line:

yy1=m(xx1)y - y_1 = m(x - x_1)

Substitute one of the points (e.g., (4,2)(4, 2)) and the slope m=43m = \frac{4}{3} to solve for bb.

I'll now calculate the y-intercept. Calculate the y-intercept using the point (4, 2) b = y1 - m * x1 bThe y-intercept is approximately b=103b = -\frac{10}{3}.

Thus, the equation of the trend line is:

y=43x103y = \frac{4}{3}x - \frac{10}{3}

Would you like more details or further explanation? Here are some related questions you might find helpful:

  1. How can we interpret the slope in the context of this trend line?
  2. How do we find the equation of a line when only given one point and the slope?
  3. What is the significance of the y-intercept in this equation?
  4. How can the equation be applied to predict values for other points on the line?
  5. How can the equation change if a different pair of points were used?

Tip: To graph a line, you can plot the y-intercept and then use the slope to find additional points!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form
Scatter Plots

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Slope-intercept form: y = mx + b

Theorems

Equation of a Line

Suitable Grade Level

Grades 8-10