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Rearranging Formulas

Aligned to A-CED.A.4 — Common Core State Standards for Mathematics.

What this lesson teaches

Solve a formula for a different variable using the same inverse operations you use for equations, treating the other letters as constants.

Worked example

Solve A = ½bh for h. Multiply both sides by 2: 2A = bh. Divide both sides by b: h = 2A / b.

Practice questions

  1. Solve d = rt for t.
  2. Solve P = 2l + 2w for w.
  3. Solve y = mx + b for x.

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Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.

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En español

Despejar Fórmulas

Despeja una fórmula para otra variable usando las mismas operaciones inversas que en las ecuaciones, tratando las demás letras como constantes.

Ejemplo: Despeja h en A = ½bh. Multiplica ambos lados por 2: 2A = bh. Divide ambos lados entre b: h = 2A / b.

More Algebra lessons

Solving Linear Equations and InequalitiesA-REI.B.3Solving Quadratic Equations by FactoringA-REI.B.4Parts of an ExpressionA-SSE.A.1Rewriting by StructureA-SSE.A.2Equivalent Forms of ExpressionsA-SSE.B.3Operations with PolynomialsA-APR.A.1

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