Math Problem Statement

how to plot y=mx+b on a graph

Solution

To plot the line defined by the equation y=mx+by = mx + b, where mm is the slope and bb is the y-intercept, follow these steps:

  1. Identify the Slope and Y-Intercept:

    • The slope mm tells you how steep the line is. It indicates the rise (change in yy) over the run (change in xx).
    • The y-intercept bb is where the line crosses the y-axis. This is the point (0,b)(0, b).
  2. Plot the Y-Intercept:

    • Start by plotting the point (0,b)(0, b) on the y-axis. This is where the line intersects the y-axis.
  3. Use the Slope to Find Another Point:

    • From the y-intercept, use the slope mm. If m=riserunm = \frac{\text{rise}}{\text{run}}, move up (or down if mm is negative) by the rise and right by the run. For example, if m=23m = \frac{2}{3}, go up 2 units and right 3 units from the y-intercept to plot another point.
  4. Draw the Line:

    • Once you have at least two points, draw a straight line through them. This line represents all solutions to y=mx+by = mx + b.
  5. Extend the Line and Add Arrows (Optional):

    • Extend the line in both directions to cover the range of xx values you're interested in. Adding arrows on both ends indicates that the line continues infinitely.

Would you like a plot for a specific slope and y-intercept value, or do you have any questions?

Here are five follow-up questions to consider:

  1. What does changing the slope mm do to the line?
  2. How does changing the y-intercept bb affect the line’s position?
  3. How would you plot a line if only two points on the line are given?
  4. How can you determine if two lines are parallel from their equations?
  5. How would you plot a vertical or horizontal line?

Tip: Always check your points after plotting to ensure they satisfy the equation y=mx+by = mx + b.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Graphing

Formulas

y = mx + b

Theorems

Slope-Intercept Form Theorem

Suitable Grade Level

Grades 6-8