Math Problem Statement

Graph the linear equation x + 4y = -8

Solution

The given equation is:

x+4y=8x + 4y = -8

To graph this linear equation, it's helpful to convert it to slope-intercept form (y=mx+by = mx + b), where mm is the slope and bb is the y-intercept.

Step 1: Solve for yy

Start by isolating yy on one side of the equation.

x+4y=8x + 4y = -8 Subtract xx from both sides:

4y=x84y = -x - 8 Now, divide both sides by 4:

y=14x2y = -\frac{1}{4}x - 2

Step 2: Identify the slope and y-intercept

  • The slope (mm) is 14-\frac{1}{4}, meaning the line goes down 1 unit for every 4 units it moves to the right.
  • The y-intercept (bb) is 2-2, meaning the line crosses the y-axis at (0,2)(0, -2).

Step 3: Plotting the line

  1. Start by plotting the y-intercept (0,2)(0, -2).
  2. Use the slope 14-\frac{1}{4} to find another point. From (0,2)(0, -2), move right 4 units (positive direction on the x-axis) and move down 1 unit (negative direction on the y-axis) to get the point (4,3)(4, -3).
  3. Draw a straight line through the points (0,2)(0, -2) and (4,3)(4, -3).

Would you like me to provide the graph as well? Let me know if you'd like further details or if you have questions!

Here are some related questions:

  1. How can you find the x-intercept of a linear equation?
  2. What does the slope of a line represent geometrically?
  3. How do you graph a line if you are given two points?
  4. How do you convert a standard form equation to slope-intercept form?
  5. What is the significance of a negative slope in a linear equation?

Tip: Always try to find both intercepts (x and y) for better accuracy when graphing lines.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Slope-Intercept Form

Formulas

Slope-intercept form y = mx + b

Theorems

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Suitable Grade Level

Grades 8-10