1. Write the function clearly
Start by identifying the dependent variable and independent variable. For a common function written as y = f(x), the calculator needs an expression that describes y for each x value. For example, y = x^2 - 4 is a quadratic function.
2. Enter the expression
Open the online graphing calculator, choose Graph mode, and enter the expression using x. In this starter tool, write powers with ^, multiplication with *, and functions such as sin(x) using parentheses.
3. Plot and inspect the viewing window
Choose Plot to sample the function across the current x-range. If the graph looks compressed or parts of the curve are off screen, zoom in or out. The viewing window changes which section of the function you can see; it does not change the underlying equation.
4. Look for important features
Depending on the function, you may be able to estimate x-intercepts, y-intercepts, turning points, symmetry, and increasing or decreasing intervals from the graph. A plotted curve is a visual estimate, so use algebra or a more advanced tool when exact values are required.
5. Know the limitations
Numerical plotting samples points and connects them. Discontinuities, very steep sections, and functions outside the supported syntax may not display perfectly. This browser tool is a learning aid rather than a full symbolic graphing system.
Related resources
Review degrees versus radians, scientific notation, and common calculator errors for more practice.