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Published byRoxanne Francis Modified over 8 years ago

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Solving Addition and Subtraction Equations

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Inverse operation is an operation that “undoes” another operation. Addition and subtraction are inverse operation. Equivalent equations are two equations that have the same solution(s)

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Subtraction Property of Equality Subtracting the same number from each side of an equation produces an equivalent equation. Algebra: x + a = b x + a – a = b - a

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Addition Property of Equality Adding the same number to each side of an equation produces an equivalent equation. Algebra: x - a = b x – a + a = b + a

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Modeling Solve x − 5 = −1.

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Practice

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2 = 1.3 + a + 4

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Real-life Application A company has a profit of $120.50 today. This profit is $145.25 less than the profit P yesterday. Write an equation that can be used to find P. Then, solve for P.

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HW: 1,2, 3, 7, 11, 15, 18 – 20, 21, 25, 29-33 odds

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