solving proportions

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What is a proportion?

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A proportion is an equation that states that two ratios are equal.

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CCSS.7.RP.A.2A

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How do you set up a proportion from a word problem?

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Identify two ratios from the problem and set them equal to each other.

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What is the cross-multiplication method in solving proportions?

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Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

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CCSS.5.NF.B.5B

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CCSS.7.RP.A.2C

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CCSS.HSA.REI.A.2

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What does it mean if two ratios are in proportion?

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It means that the two ratios represent the same relationship between quantities.

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CCSS.6.RP.A.3A

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How can you check if two ratios are equivalent?

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You can cross-multiply and see if the products are equal.

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CCSS.6.RP.A.3A

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y = 10.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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CCSS.7.RP.A.2B