FORMULAS

Variables:

m = slope/gradient

a = x-intercept

b = y-intercept

(x1, y1) = any coordinate on the line

A, B, & C = constants

1. Slope-intercept form :

                    y = mx + b

2. Point-slope form : 

                    y-y1 = m(x-x1)

3. Standard form :

                    Ax + By + C = 0

4. Intercept form :

                    x/a + y/b = 1