Review for 1.1-1.2

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What is the equation to find how many pages Ruben read on Sunday if he read 21 pages on Saturday and 37 pages in total?

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21 + n = 37

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CCSS.HSA.CED.A.3

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x = -6

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CCSS.8.EE.C.7B

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n = -5

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CCSS.8.EE.C.7B

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k = 8

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CCSS.7.EE.B.4A

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x = -19

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CCSS.7.EE.B.4A

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Subtract 21 from both sides to isolate n.

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CCSS.6.EE.B.7

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What does it mean to isolate a variable in an equation?

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

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CCSS.7.EE.B.4A

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x = 7

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CCSS.6.EE.B.7

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Distribute 3, combine like terms, and then isolate x.

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CCSS.8.EE.C.7B

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n = -5

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CCSS.8.EE.C.7B