General Form
Ax + By + C = 0
Point-Slope Form
m = y1 - y2 / x1 - x2
Slope-Intercept Form
y = mx + b
General Term (sequences)
an = a + (n - 1)d
The term used when figuring out the sum of all of the terms in a sequence.
Sn = n
_ ( 2a + (n - 1)d)
2