Graph created with Desmos.com. Nonlinear Function vs. Linear Function: Steps In order to figure out if your function is linear or nonlinear, you have several options. From easiest to hardest, they are: Study the equation. If it neatly fits the equation y = mx + b, then it’s linear....
The graph of f(x)=3x (red) is increasing. the graph of f(x) =-3x + 9 (blue) is decreasing. Increasing functions travel upwards from left to right; asxincreases,ydecreases. With decreasing functions, as you move from left to right, the graph goes downward. In other words, asxincreas...