Math Problem Statement

Write an equation in slope-intercept form for the linear function shown in the graph.

Solution

To determine the equation of the line in slope-intercept form y=mx+by = mx + b, we need to find the slope (mm) and the y-intercept (bb).

  1. Y-intercept (b): Observing the graph, the line crosses the y-axis at y=3y = -3. So, b=3b = -3.

  2. Slope (m): To find the slope, use two points on the line. We can see the points (6,6)(-6, -6) and (0,3)(0, -3) on the line.

    • Slope m=ΔyΔx=3(6)0(6)=36=12m = \frac{\Delta y}{\Delta x} = \frac{-3 - (-6)}{0 - (-6)} = \frac{3}{6} = \frac{1}{2}.

Thus, the equation of the line is: y=12x3y = \frac{1}{2}x - 3

Would you like a more detailed explanation, or do you have any questions?

  1. What is slope-intercept form?
  2. How do you calculate the slope between two points?
  3. Why is the y-intercept important in an equation?
  4. What other forms can we use to represent linear equations?
  5. How do we interpret positive vs. negative slopes?

Tip: Always choose clearly visible points on the line to accurately calculate the slope.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

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

Theorems

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Suitable Grade Level

Grades 7-9