How to Use the Desmos Graphing Calculator (Must Learn to Give SAT)

Key points

• Type the equation as written; click the gray points for intercepts, vertex and intersections.
• Systems: graph both equations — the intersection point is the solution.
• Equation in x only? Desmos draws a vertical line at each solution.
• Unknown constant $k$? Type it as a letter, add a slider, drag until it fits.
• Table of data: add a table, then type $y_1\sim mx_1+b$ for the regression.
• Exponential fit: $y_1\sim ab^{x_1}$. Desmos returns $a$ and $b$.
• Equivalent expressions: graph both — identical curves mean equivalent.