1. Slope & Slope-Intercept Equations

2. Slope is the measure of the steepness of a line!
IN LAYMAN’S TERMS:
Slope is the measure of the steepness of a line!

3. HOW IT’S FIGURED: **OR** VERTICAL CHANGE ___________________
STEEPNESS =
HORIZONTAL CHANGE
**OR**
Change in Y-axis
___________________
SLOPE (m) =
Change in X-axis

4. Steps Determine Point 1 & 2 Label x1, y1, x2, y2
Substitute in the formula:

5. Find the slope of a line that contains points A(-2, 5) B(4, -5)
WORK TIME!
Find the slope of a line that
contains points A(-2, 5) B(4, -5)

6. HERE’S HOW YOU SOLVE IT:
Change in Y-axis
___________________
SLOPE (m) =
Change in X-axis
5 – (-5)
___________________
m of line AB =
-2 - 4 10
___________________ = -6 5
___________ - = 3

7. NOW TRY THESE ON YOUR OWN
Find the slope of a line that
contains each pair of points:
R(9, -2) S(3, -5)
M(7, -4) N(9, 4)

8. True or False??
ALL HORIZONTAL LINES
HAVE THE SAME SLOPE

9. #1: All horizontal lines have the same slope. TRUE
THE ANSWER!
#1: All horizontal lines have the same slope. TRUE

10. TWO LINES MAY HAVE
THE SAME SLOPE

11. #2: Two lines may have the same slope. TRUE
THE ANSWER!
#2: Two lines may have the same slope. TRUE

12. PASSES THROUGH THE ORIGIN
A LINE WITH A SLOPE OF 1
PASSES THROUGH THE ORIGIN

13. #3: A line with a slope of 1 passes through the origin. FALSE
THE ANSWER!
#3: A line with a slope of 1 passes through the origin. FALSE

14. Use the Slope to Graph a Line
You will need an ordered pair and the slope
Graph the line that passes through (1,4) and has a slope