Stage 21 · Linear Functions

21.3.1 Rising or Falling Comes Down to the Sign of k

21.3 Reading the Behavior of a Linear Function

Point 1 of 5

21.3.1 Rising or Falling Comes Down to the Sign of k

Core idea

When k>0, larger x means larger y (the line goes up), and when k<0 it's the other way around — this is whether the function increases or decreases.

Module goal. Systematically describe how the signs of k and b decide a line's direction, whether it rises or falls, and which quadrants it visits — upgrading you from "able to draw" to "able to read."

eastmath.com · 21.3 Reading the Behavior of a Linear Function · 21.3.1 Rising or Falling Comes Down to the Sign of k