Math Problem Statement

Write an equation of the line shown in the graph.

Solution

The graph shows a line passing through the points (4,3)(-4, 3) and (4,3)(4, -3).

Steps to find the equation of the line:

  1. Find the slope (m): The slope mm of a line passing through two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is given by: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Substituting the points (4,3)(-4, 3) and (4,3)(4, -3): m=334(4)=68=34m = \frac{-3 - 3}{4 - (-4)} = \frac{-6}{8} = -\frac{3}{4} So, the slope m=34m = -\frac{3}{4}.

  2. Use the point-slope form of the equation: The equation of a line with slope mm through a point (x1,y1)(x_1, y_1) is given by: yy1=m(xx1)y - y_1 = m(x - x_1) Using the point (4,3)(-4, 3) and the slope m=34m = -\frac{3}{4}: y3=34(x+4)y - 3 = -\frac{3}{4}(x + 4)

  3. Simplify the equation: y3=34x3y - 3 = -\frac{3}{4}x - 3 Adding 3 to both sides: y=34xy = -\frac{3}{4}x

So, the equation of the line is: y=34xy = -\frac{3}{4}x

Would you like a detailed breakdown of any step, or have any other questions?

Here are some related questions:

  1. How would the equation change if the slope were positive?
  2. What if the line passed through the origin—how would the equation look?
  3. Can you convert this equation into standard form Ax+By=CAx + By = C?
  4. What is the y-intercept of this line?
  5. How would you graph this equation by hand?

Tip: To find the slope easily from a graph, you can count the "rise over run" between two clear points.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Slope-Intercept Form

Formulas

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

Theorems

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Suitable Grade Level

Grades 8-10