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Solve a system of two linear equationsTactic

Tactic

Solve a system of two linear equations

Cancel one variable, then answer what's asked

10 min 6 stepsGraded practice at the end

Two equations are two witnesses describing the same pair of numbers. Get their stories to line up, and the answer walks right out.

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
Eliminate a variableTechniqueScale to opposites, add, and one variable cancels
Define variables with unitsTechniqueName every unknown and its unit before you write

Used by

Find constants from an identityTacticMatch every power of x and the constants fall out

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