Math Problem Statement

What is the equation of this line?

Solution

The problem asks for the equation of the line displayed in the graph.

Step-by-Step Explanation:

  1. Slope of the Line (m): The slope can be determined by observing the rise over run between two points on the line. Based on the graph:

    • The line passes through the points (0, -2) and (2, 4).
    • Slope m=riserun=4(2)20=62=3m = \frac{\text{rise}}{\text{run}} = \frac{4 - (-2)}{2 - 0} = \frac{6}{2} = 3.
  2. Y-Intercept (b): The line crosses the y-axis at y=2y = -2. Thus, the y-intercept b=2b = -2.

Using the slope-intercept form y=mx+by = mx + b, we substitute m=3m = 3 and b=2b = -2, giving us the equation: y=3x2y = 3x - 2

Thus, the correct equation is y=3x2y = 3x - 2, which matches the first option.

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Here are 5 related questions:

  1. How do you calculate the slope of a line if two points are given?
  2. What is the general formula for the slope-intercept form of a line?
  3. How do you find the equation of a line if you are given the slope and a point?
  4. What does the y-intercept tell you about the graph of a line?
  5. How can you tell the steepness of a line from its slope?

Tip: The slope indicates how steep a line is—larger slopes mean steeper lines, and negative slopes indicate a downward direction.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

Slope-intercept form: y = mx + b
Slope = rise/run

Theorems

Slope Formula
Y-Intercept

Suitable Grade Level

Grades 7-9