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Prepdle

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Model and optimize with inequalitiesTactic

Tactic

Model and optimize with inequalities

Write the limit, solve at its edge, round to what fits

10 min 6 stepsGraded practice at the end

Every budget question has a line you can't cross. I spent years testing lines like that, mostly the lunch line.

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

Inequality manipulationTechniqueSolve like an equation; flip for negatives
Test a point; read a regionTechniquePlug the point in, then read the line and the shading
Convert between linear formsTechniqueRewrite a line to show the feature you need
Define variables with unitsTechniqueName every unknown and its unit before you write

Other routes

Graph it (Desmos)TacticTurn the question into a point you can click
Backsolve from the choicesTacticTest the middle choice, then step up or down