One Step Equations (Addition and Subtraction)

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What is a variable in an equation?

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A variable is a symbol (like x or p) that represents an unknown value in an equation.

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p

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x = 8 (Subtract 3 from both sides).

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a = 19 (Subtract 9 from both sides).

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What does it mean to 'isolate the variable' in an equation?

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To isolate the variable means to get the variable alone on one side of the equation.

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Subtract 4 from both sides.

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x = 15 (Add 5 to both sides).

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a = 13 (Subtract 7 from both sides).