Math Problem Statement

What is the equation of the line shown above?

What is the equation of the line shown above?

Solution

To determine the equation of the line in the given graph, let us analyze the graph and extract the key features:

  1. Identifying two points on the line:

    • From the graph, the line passes through these points:
      • Point 1: (0,2)(0, -2) (the y-intercept).
      • Point 2: (2,4)(2, -4).
  2. Calculating the slope (mm): The slope mm is calculated as: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Substituting the coordinates of the two points: m=4(2)20=4+22=22=1m = \frac{-4 - (-2)}{2 - 0} = \frac{-4 + 2}{2} = \frac{-2}{2} = -1

  3. Writing the equation of the line: Using the slope-intercept form of a line: y=mx+by = mx + b Substituting the slope m=1m = -1 and the y-intercept b=2b = -2: y=x2y = -x - 2

Thus, the equation of the line is: y=x2y = -x - 2


Would you like further details about this solution or another representation of the equation?

Here are 5 related questions to deepen your understanding:

  1. How do you find the equation of a line if two points are not directly visible on the graph?
  2. What happens to the equation of a line if its slope is positive instead of negative?
  3. How does the y-intercept affect the position of the line on a graph?
  4. How can you rewrite y=x2y = -x - 2 in standard form (Ax+By=CAx + By = C)?
  5. How do parallel lines differ in their equations?

Tip: Always double-check the points chosen from the graph, as errors in identifying points will lead to incorrect calculations of slope and equation!

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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

Concept of Slope
Linear Equation Properties

Suitable Grade Level

Grades 7-9