Master the SAT Desmos calculator

The two sides of x squared minus 2x equals x plus 4 become a parabola and a line that meet twice. Typing the whole equation draws vertical lines through both meetings, at x equals negative 1 and x equals 4. A slider raises a parabola until it touches the x-axis once. Entering a table value plots a third point, and a linear fit describes the three points. The demonstration tests line equations against two points. The final graph is y equals three x plus eleven and labels the point (four, twenty-three), with x as input and y as output.