Math Problem Statement

Write the equation of this line in slope-intercept form using the graph provided.

Solution

Let’s analyze the graph and determine the slope-intercept form of the equation for the line. Here's how we solve this step by step:

Step 1: Recall the slope-intercept form

The slope-intercept form of a line is: y=mx+by = mx + b Where:

  • mm is the slope of the line.
  • bb is the y-intercept (where the line crosses the y-axis).

Step 2: Determine the slope mm

The slope is calculated using two points on the line: m=ΔyΔx=y2y1x2x1m = \frac{\Delta y}{\Delta x} = \frac{y_2 - y_1}{x_2 - x_1}

From the graph:

  • Point 1: (6,6)(-6, 6)
  • Point 2: (0,2)(0, -2)

Using these points: m=260(6)=86=43m = \frac{-2 - 6}{0 - (-6)} = \frac{-8}{6} = -\frac{4}{3}

So, the slope is m=43m = -\frac{4}{3}.


Step 3: Find the y-intercept bb

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


Step 4: Write the equation

Now that we know m=43m = -\frac{4}{3} and b=2b = -2, the equation of the line is: y=43x2y = -\frac{4}{3}x - 2


Final Answer:

The equation of the line in slope-intercept form is: y=43x2y = -\frac{4}{3}x - 2

Would you like further details or assistance? Here are some related questions:

  1. How do we verify the slope using different points on the line?
  2. What is the significance of slope in real-world contexts?
  3. Can you explain how to convert this equation to standard form?
  4. How do we graph a line starting from the slope-intercept form equation?
  5. What is the impact of changing the slope or intercept values?

Tip: Always choose clear points on the graph (where the line crosses grid intersections) to calculate the slope accurately.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing

Formulas

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

Theorems

Linear equation representation on a Cartesian plane

Suitable Grade Level

Grades 7-10