21.2 Linear Functions Arrive: Sliding the Whole Line
Point 4 of 5
21.2.4 Drawing a Linear Graph with Two Points
Core idea
Two points fix a line: take (0,b) and the spot where it meets the x-axis, connect them, and you've drawn y=kx+b.
Module goal. Generalize from direct-proportion functions to the general linear function y=kx+b, understand what b means geometrically, and draw the graph in full.
eastmath.com · 21.2 Linear Functions Arrive: Sliding the Whole Line · 21.2.4 Drawing a Linear Graph with Two Points