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Combining Like Terms

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Only combine terms that are exactly the same!! Whats the same mean? –If numbers have a variable, then you can combine only ones that have the same variable –You can also combine numbers that have no variables

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Vocabulary Simplify Rewrite an expression as simply as possible. Reducing to lowest terms.

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5 pillows + 3 pillows 8 pillows

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5a + 3a 8a

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8c - 3c 5c

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5 cats + 3 dogs

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Examples Which terms are the same or like terms? 5x, 8y, 9z, 10, 12x, 14z, 7 Same: 5x and 12x Same: 10 and 7 Same: 9z and 14z

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12r – 8 – 12

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12r –8 –12 12r –8 –12 12r – 20

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Lets try it! 4x + 9x 13x -7y + 9y 2y -8y + (-4y) -12y 4x + 8y + 10x 14x + 8 y 5 + 8x + 7y + 10 8x + 7y + 15

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We can only add and subtract like terms

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Practice Problems: 1.4x + 5y – 2x + 3y 2.5x - 3y) + 2x + y 3.3 + 5x – 4y + 2y – 8x 4.(-13) + (-2y) + (-7) – 4y 5. 16x – 3y - 4y – 3x

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Chapter 1 Lesson 1 Variables and Expressions

Chapter 1 Lesson 1 Variables and Expressions

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