Stage 30 · Analytic Geometry
30.2.4 Two-Point and Intercept Forms
30.2 Lines: Direction, Slope, and Equations
Point 4 of 5
30.2.4 Two-Point and Intercept Forms
Core ideaPin down two points and the line is fixed; measure the footprints a and b it leaves on the two axes and write x/a+y/b=1.
Module goal. Start from how steep a line is, master slope and the various forms of a line's equation, and learn to write down any line in the coordinate plane.