Math Problem Statement

Write an equation of the line below.

Solution

To determine the equation of the line shown in the graph, we can follow these steps:

  1. Find the slope (m):

    • The slope of a line is calculated as the change in yy (rise) divided by the change in xx (run) between two points on the line.
    • From the graph, we can observe two points that lie on the line. One appears to be (6,3)(-6, 3), and the other appears to be (0,2)(0, -2), which is also the y-intercept.

    Using the formula for slope mm:

    m=y2y1x2x1=230(6)=56m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{-2 - 3}{0 - (-6)} = \frac{-5}{6}

    So, the slope is m=56m = -\frac{5}{6}.

  2. Identify the y-intercept (b):

    • From the graph, the line crosses the yy-axis at (0,2)(0, -2), so the y-intercept b=2b = -2.
  3. Write the equation:

    • The equation of a line in slope-intercept form is y=mx+by = mx + b. Substituting the values of mm and bb:

    y=56x2y = -\frac{5}{6}x - 2

Thus, the equation of the line is y=56x2y = -\frac{5}{6}x - 2.

Would you like a detailed explanation of any part of this process?

Here are some related questions:

  1. How do you calculate the slope if the points aren't given explicitly?
  2. What is the point-slope form of a line?
  3. How do you convert point-slope form to slope-intercept form?
  4. How do you graph a line if you are only given the equation?
  5. Can you find the equation of a line if you are given only the slope and a point?

Tip: Always double-check the coordinates you pick from the graph to ensure the calculation is accurate!

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Math Problem Analysis

Mathematical Concepts

Slope
y-intercept
Slope-intercept form of a linear equation

Formulas

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

Theorems

The formula for the slope of a line between two points
Slope-intercept equation of a line

Suitable Grade Level

High School