2 1
2 1
y ym
x x
−=−
2 22 1 2 1( ) ( )d y y x x= − + −
1 2 1 2,2 2
x x y y+ + =
•Think vertebra to help with visual•Undefined S lope! (cannot walk up walls )•Form x=#
•Think horizon to help with visual•S lope = Zero (walking acros s left to right there is no incline or decline)•Form y=#
S lope-Intercept Form
Ax By C+ =•x and y on the same s ide•A is pos itive•No fractions
Point-S lope Form
1 1( )y y m x x− = −•helps to find b and write the equation of a line all at once
•Do not intersect•Have the same s lopes•S ymbol: ||
Perpendicular Lines
•Intersect at a right angle/90⁰•Have s lopes that are oppos ite, reciprocals of each other (flip it and switch it)•S ymbol: ⊥
Quadratic Formula
2 4
2
b b acx
a
− ± −=
•A lso known as roots and zeros•Where the graph cros ses the x-axis•Plug 0 in for y and solve for x•Answer: (#,0) as an ordered pair
•Where the graph cros ses the y-axis•Plug 0 in for x and solve for y•Answer: (0,#) as an ordered pair