Math Problem Statement

What is the equation of the line shown in the coordinate plane in slope-intercept form, y = mx + b?

Solution

From the image provided, you have a problem asking to determine the equation of a line on a coordinate plane, in the slope-intercept form y=mx+by = mx + b.

Let me analyze the graph and break this down step by step:


Steps to Find the Equation of the Line

  1. Find the slope (mm):

    • Slope is calculated as m=ΔyΔxm = \frac{\Delta y}{\Delta x} (rise over run).
    • From the graph, select two points on the line. For example:
      • Point 1: (4,6)(-4, -6)
      • Point 2: (0,2)(0, -2)
    • Calculate the slope: m=2(6)0(4)=2+64=44=1m = \frac{-2 - (-6)}{0 - (-4)} = \frac{-2 + 6}{4} = \frac{4}{4} = 1 So, the slope is m=1m = 1.
  2. Find the y-intercept (bb):

    • The y-intercept is where the line crosses the y-axis (x=0x = 0).
    • From the graph, the line crosses the y-axis at (0,2)(0, -2).
    • Thus, the y-intercept is b=2b = -2.
  3. Write the equation:

    • Using y=mx+by = mx + b, substitute m=1m = 1 and b=2b = -2: y=1x2or simplyy=x2.y = 1x - 2 \quad \text{or simply} \quad y = x - 2.

Final Answer:

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


Would you like me to explain any part of this in more detail or go over another example?


Relative Questions:

  1. What does the slope of a line tell us about its steepness or direction?
  2. How can you determine the slope if the graph isn’t clear and you only have two points?
  3. Why is the y-intercept significant in understanding a line's equation?
  4. How can you rewrite y=mx+by = mx + b into standard form?
  5. What happens to the equation of a line if the slope becomes zero?

Tip:

Always double-check your chosen points for accuracy when calculating the slope to avoid errors in the equation!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Coordinate Geometry

Formulas

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

Theorems

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Suitable Grade Level

Grades 6-8