Chapter 8 – Functions and Graphing

8.3 – Graphing Linear Equations Using

Intercepts

The graph of a linear function may cross either the x-axis, the y-axis, or both axes.

Intercepts

• The x-intercept is the x-coordinate of the point where the graph crosses the x-axis.

• The y-intercept is the y-coordinate of the point where the graph crosses the y-axis.

Identify the x- and y-intercepts.

The y-intercept and x-intercept can be used to graph a linear equation.

• To find the x-intercept, let y = 0 in the equation and solve for x.

• To find the y-intercept, let x = 0 in the equation and solve for y.

Find the x-intercept and the y-intercept for each equation. Then graph the equation.

x + 2y = 4 y = 3x - 6

Some linear equations have just one variable. Their graphs are horizontal or vertical lines.

Questions?

• Homework:

8.3 WKS