A graph mirrored across the y-axis is even with f(-x) = f(x), and one symmetric about the origin is odd with f(-x) = -f(x).
Module goal. Learn to capture a function's rise and fall, symmetry, and high and low points from both the graph and the symbols, getting ready to analyze linear functions
eastmath.com · 20.6 Reading a Function's Behavior off Its Graph · 20.6.3 Even and Odd Functions