Warm Up
Find the x and y intercepts of: -4x+2y=8
Then graph the equation using on
those two points.
The y coordinate of the
x-intercept is always __________
The x coordinate of the
y-intercept is always ___________
11­6 Slope: refers to the steepness of a line
or or •
•
The slope of all horizontal lines is zero.
The slope of all vertical lines is undefined.
Positive Negative
Zero Undefined (No Slope) Use this formula when you have the graph of a
line.
When you have the graph of a line,
use rise over run to find the slope.
Start with the bottom point. Then
rise up, then run over.
You also can find the slope of a line using two
ordered pairs.
where
(x1,y1) (x2,y2)
are two
points on a
line
EX Find the slope of a line passing through
(2,4) and (-1,6).
If (x1,y1)=(2,4) and
(x2,y2))=(-1,6)
then m=
Find the slope.
(-3,4)(5,-1)
(0,-7)(2,-3)
On your calculator, do:
What does it say?
now do
What does it say?
Remember the difference
If the slope of a line =0, then the line must be __________
If the slope of a line is undefined, the line must be
_______