The Ultimate Digital SAT Desmos Cheat Sheet.
Solve in 15 seconds.
The built-in Desmos graphing calculator on Bluebook is the most powerful tool on the Digital SAT. Master these 10 syntax hacks to bypass difficult manual algebra and avoid calculation errors.
Top 10 SAT Desmos Tactics
Copy these exact syntax rules into your Desmos calculator on practice tests.
Find Intersections Without Elimination
Type both linear/nonlinear equations into separate rows. Click the gray dot at the intersection point to view $(x, y)$.
Find Solutions & X-Intercepts
Set quadratic or polynomial expressions equal to 0, or type $y = f(x)$ and click the x-axis intercepts for exact roots.
Instant Min/Max Reading
Click the crest or trough of any parabola to directly read the maximum height or minimum cost $(h, k)$.
Find Constant 'k' for Single Solution
When an equation contains unknown constant $k$, add a slider for $k$ and drag until the graph touches at exactly 1 point (tangency).
Table Linear & Exponential Regression
Add table `(x₁, y₁)`. Type `y₁ ~ mx₁ + b` for line of best fit, or `y₁ ~ ab^(x₁)` for exponential curve fitting.
Verify Equivalent Expressions
To check which answer choice (A, B, C, D) matches a complex expression, subtract the choice: `Original - Choice = 0` (flat line on y=0).
Expanded Circle Center & Radius
Enter unfactored circle equation $x^2 + y^2 - 10x + 6y = 15$. Click opposite edge points to compute diameter and center.
List Mean, Median & StDev
Create list `L = [12, 15, 18, 22, 29]`. Use `mean(L)`, `median(L)`, and `stdev(L)` to solve data spread questions without typos.