Math Problem Statement

Write an equation for the graph in slope-intercept form, i.e., y = mx + b.

Solution

To find the equation of the given line in slope-intercept form y=mx+by = mx + b, let's identify the slope mm and the y-intercept bb from the graph.

1. Determine the Slope (mm):

The slope can be calculated using the formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Let's choose two points from the graph:

  • Point 1: (2,4)(-2, 4)
  • Point 2: (4,2)(4, -2)

Now calculate the slope: m=244(2)=66=1m = \frac{-2 - 4}{4 - (-2)} = \frac{-6}{6} = -1

2. Find the Y-intercept (bb):

The y-intercept is the point where the line crosses the y-axis. From the graph, the line crosses the y-axis at (0,2)(0, 2). Thus, b=2b = 2.

3. Write the Equation:

Using m=1m = -1 and b=2b = 2, the equation of the line is: y=x+2y = -x + 2

Would you like a detailed explanation on any specific part?

Related Questions:

  1. How do you find the slope when only given two points?
  2. What are the characteristics of a line when the slope is negative?
  3. How do you determine the y-intercept if it isn’t clearly visible on a graph?
  4. What does the slope-intercept form y=mx+by = mx + b represent geometrically?
  5. How would the graph change if the slope was positive instead of negative?

Tip:

When finding the slope, always remember to subtract yy-coordinates and xx-coordinates in the same order to avoid sign errors.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

Slope formula m = (y2 - y1) / (x2 - x1)
Slope-Intercept Form y = mx + b

Theorems

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Suitable Grade Level

Grades 7-9