Formulas
Slope Formula
m = y-y/x-x
(1,1) and (4,3)
2/3
Slope = 2 y-intercept = -3
y= 2x -3
2x + y = 3
y= -2x +3
How do you find the x intercept?
Set y= 0
Slope Intercept Formula
y = mx + b
(5,9) and (3,9)
0
Slope = -3/4 y-intercept = 6
y= -3/4x + 6
4x -y = 0
y = 4x
How do you find the y-intercept?
set x = 0
Standard Form
Ax + By = C
(7,8) and (7, 5)
Undefined
Slope = 5/4 y-intercept = 8
y= 5/4x + 8
-6x + 4y = 20
y = 3/2 x + 5
What Holiday happens next week?
Find Slope from a graph (positive)
Rise over Run
(-1, 9) and (2,3)
-2
Slope = -1/2 y-intercept = -7
y= -1/2x - 7
4x + 10y = 10
y =-2/5x + 1
What day do we come back from break?
Monday Nov 29
Find Slope From a Graph (negative)
Fall over crawl
(5,6) and (6, 5)
-1
Slope = -5 y-intercept= 10
y= -5x + 10
3x + 3y = -12
y = -1x -4
Are you ready for a break?
YES!