Feel free to start by putting the 2 white points anywhere you'd like. [br]Then slide the slider. [br][br][b][color=#0000ff]The function is INCREASING at all input ([i]x[/i]) values for which its graph is BLUE. [/color][/b][br][b][color=#ff0000]The function is DECREASING at all input ([i]x[/i]) values for which its graph is RED.[/color][/b] [br][b]The function is CONSTANT at all input ([i]x[/i]) values for which its graph is BLACK. [/b]