1. Linear Functions What is a Linear Function?
It can be written in one of two forms:
Slope-Intercept Form→y = mx + b
Standard Form→Ax + By = C
It’s graph is a non-vertical straight line.
It has a constant rate of change.

2. X-and Y-Intercepts Most linear functions have an x- and y- intercept.
Y-intercept is the y-coordinate of the point where the graph crosses the y-axis. The x-coordinate is ALWAYS zero. (O, y)
X-intercept is the x-coordinate of the point where the graph crosses the x-axis. The y-coordinate is ALWAYS zero. (x, O)

3. Finding x-and y-intercepts
Example: Find the x- and y-intercepts. −6𝑥−8𝑦=24 x-int: Replace y with O y-int: Replace x with O
−6𝑥−8(0)=24
−6 0 −8𝑦=24
−6𝑥=24
−8𝑦=24
𝑥=−4
𝑦=−3
x-intercept is -4
y-intercept is -3