Math basics › Lines and systems
Forms of a line
Slope-intercept
y = mx + b. m is the slope, b is where it crosses the y-axis. Best for graphing.
Point-slope
y − y₁ = m(x − x₁). Best when you know a point and the slope, which is most of the time.
Standard
Ax + By = C. Best for finding both intercepts fast: set x = 0, then set y = 0.