Loading

Prepdle

Loading the lesson

Test a point; read a regionTechnique

Technique

Test a point; read a region

Plug the point in, then read the line and the shading

3 min 3 steps

A point is either in the solution set or out, and one substitution settles it. Getting into the school dance was never that clear-cut for me.

Meet it
Run it
Quick check

The first step is free. A free account opens the rest.

Calls on

Negative multipliers flip inequalitiesFactA negative multiplier reverses the inequality

Used by

Backsolve from the choicesTacticTest the middle choice, then step up or down
Match or verify a representationTacticTest the point where the choices disagree
Model and optimize with inequalitiesTacticWrite the limit, solve at its edge, round to what fits
Circle equations, points, and tangentsTacticGet to standard form, then read center and radius