This video pulls together the core ways to solve constant problems efficiently, both algebraically and with Desmos, and explains when to use each method. You’ll learn the matching strategy for problems with no solutions or infinite solutions (phrases like “no values of x” or “true for all values of x”), where you match coefficients or slopes to reflect parallel lines or identical equations. You’ll also review the substitution strategy, used when constants are tied to given points or function notation, by plugging values directly into slope formulas or equations.

The second half shows how to solve the same problems faster in Desmos. You’ll see how to use sliders to test constants visually for infinite or no-solution cases (lining graphs up or making them parallel), how to handle multiple constants by adjusting one at a time, and how to double-check answers by zooming and scanning for intersections. For point-based problems, the video demonstrates tables and regression to find equations quickly—even in standard form using implicit equations. Big takeaway: mastering matching, substitution, sliders, and tables lets you solve nearly all SAT constant problems faster and with fewer algebra mistakes.