SAT Math / Desmos Mastery
Save time on SAT math by comparing the work a question needs by hand and in Desmos, then checking that your result answers the question.
The system 3x plus 2y equals 18 and x minus y equals 4 asks for 4x plus y. Without Desmos, adding the two equations gives 4x plus y equals 22 in one step; in Desmos, it takes typing both equations, clicking their intersection at (5.2, 1.2), and calculating 4 times 5.2 plus 1.2. Next, the equation x squared minus 3.4x minus 5.1 equals 0 asks for its positive solution to the nearest hundredth: by hand, the quadratic formula takes four decimal calculations; in Desmos, after typing the equation, a gray pointer clicks where the positive solution crosses the x-axis, giving x approximately 4.53. Finally, the graphs of y equals (x squared minus 36) divided by (x minus 6) and y equals 12 appear to meet at (6, 12). Answer whether six satisfies the original equation using the buttons after the picture.
