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Backsolve from the choicesTactic

Tactic

Backsolve from the choices

Test the middle choice, then step up or down

10 min 6 stepsGraded practice at the end

The answer is already on the screen, hiding among three impostors. I spent years as the impostor, so I know how to check one.

Meet it
Spot it
Run it
Dodge the traps
Play with it
Prove it

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

Calls on

SubstituteTechniqueSwap in the value, parentheses and all
Test a point; read a regionTechniquePlug the point in, then read the line and the shading

Used by

Choose a routeHabitPick the fastest route first; switch when it stalls
Match or verify a representationTacticTest the point where the choices disagree

Other routes

Solve linear equations for a targetTacticRead the target first, then stop when it stands alone
Solve a system of two linear equationsTacticCancel one variable, then answer what's asked
Model and optimize with inequalitiesTacticWrite the limit, solve at its edge, round to what fits
Solve a nonlinear equationTacticLet the form pick the method, then check every root
Solve a nonlinear systemTacticSubstitute, keep every root, then find each y