21.2 Linear Functions Arrive: Sliding the Whole Line
Point 2 of 5
21.2.2 What a Linear Function Is
Core idea
Anything of the form y=kx+b (k≠0) is a linear function, and when b=0 it folds right back into the direct proportion y=kx.
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.
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