Math Problem Statement

Graph the line y = -5x + 8.

Solution

To graph the line given by the equation y=5x+8y = -5x + 8, let’s go through the steps:

  1. Identify the slope and y-intercept:

    • The equation is in slope-intercept form, y=mx+by = mx + b, where mm is the slope and bb is the y-intercept.
    • Here, m=5m = -5 and b=8b = 8.
  2. Plot the y-intercept:

    • The y-intercept is 88, so place a point at (0,8)(0, 8) on the y-axis.
  3. Use the slope to find another point:

    • The slope 5-5 can be interpreted as 5/1-5/1, meaning that for every 1 unit moved to the right (positive x-direction), we move 5 units down (negative y-direction).
    • Starting from (0,8)(0, 8), move 1 unit to the right to x=1x = 1, then move 5 units down to y=3y = 3. Place another point at (1,3)(1, 3).
  4. Draw the line:

    • Connect the points (0,8)(0, 8) and (1,3)(1, 3) with a straight line, extending it in both directions.

This line represents the equation y=5x+8y = -5x + 8 on the graph.

Would you like further details on graphing lines or the reasoning behind each step?


Here are some related questions you might find helpful:

  1. How do you graph lines with positive slopes?
  2. What is the general form of a line, and how is it different from the slope-intercept form?
  3. How would the graph change if the slope were less steep, like y=2x+8y = -2x + 8?
  4. How do you graph a line given in standard form, such as Ax+By=CAx + By = C?
  5. What is the effect of changing the y-intercept in a linear equation?

Tip: When working with a slope, remember that a negative slope means the line goes downward from left to right.

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Math Problem Analysis

Mathematical Concepts

Algebra
Graphing Linear Equations
Slope-Intercept Form

Formulas

Slope-intercept form: y = mx + b

Theorems

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Suitable Grade Level

Grades 8-10