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Systems of Equations

A1.D.1Substitution01/05

Solve a system by substitution.

The system we'll solve

{x + y = 7 2 x - y = 2

Step01of 05

Substitution shines when one equation already isolates a variable, or is one quick step from doing so. Equation 1 already has y with coefficient 1 — solve it for y:

y = 7 - x

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A1.D.1 – A1.D.5 · CCSS A.REI.C.6 / D.12 / A.CED.A.3·Full curriculum →