How can you tell if a function is increasing or decreasing?
In this video, I show you a simple way to find intervals of increase and decrease by reading a graph from left to right. Instead of memorizing rules, you’ll learn how to recognize whether a function is moving upward or downward as the x-values increase.
You’ll learn:
• What it means for a function to be increasing
• What it means for a function to be decreasing
• How to read intervals from a graph
• How to write your answers using interval notation
• Common mistakes students make
This lesson is perfect for Algebra 1, Algebra 2, Precalculus, ACT Math, and SAT Math preparation.
📝 Key Question:
As you move from left to right, is the function going up or going down?
