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U6 L3 Practice with Proportions Lesson.notebook U6 L3 Practice with Proportions Cross Product Property In a proportion, the means are the two terms closest together when written with colons. The extremes are the two terms that are furthest apart when written with colons The product of the means is = to the product of the extremes in any proportion.

U6 L3 Practice with Proportions Lesson.notebook€¦ · U6 L3 Practice with Proportions Lesson.notebook Solve for the variable in each of the proportions below. a) b) Cross Product

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Page 1: U6 L3 Practice with Proportions Lesson.notebook€¦ · U6 L3 Practice with Proportions Lesson.notebook Solve for the variable in each of the proportions below. a) b) Cross Product

U6 L3 Practice with Proportions Lesson.notebook

U6 L3 Practice with Proportions

Cross Product Property

In a proportion, the means are the two terms closest together when written with colons.  

The extremes are the two terms that are furthest apart when written with colons  

The product of the means is = to the product of the extremes in any proportion.

Page 2: U6 L3 Practice with Proportions Lesson.notebook€¦ · U6 L3 Practice with Proportions Lesson.notebook Solve for the variable in each of the proportions below. a) b) Cross Product

U6 L3 Practice with Proportions Lesson.notebook

Solve for the variable  in each of the proportions below.

a)b)

Cross Product PropertyThe product of the means is = to the product of the extremes in any proportion.

Solve and Check

x+43 =

­3x­2

6. CHECK

 1

x­2=

    x

10­5x

An important thing to keep in mind is that those those variable values that cause the denomination to become 0, can not be solutions to the equation. A number that looks to be a solution but causes the denominator of the original equation to become 0 is called an extraneous solution.

Page 3: U6 L3 Practice with Proportions Lesson.notebook€¦ · U6 L3 Practice with Proportions Lesson.notebook Solve for the variable in each of the proportions below. a) b) Cross Product

U6 L3 Practice with Proportions Lesson.notebook

Solve for x algebraically and check.

 1

x+1

x­2

3x­5=

Do NOW!

x+3

  4 9

x+3=

6. CHECK

HW for 1/31­ Do #1­2

Page 4: U6 L3 Practice with Proportions Lesson.notebook€¦ · U6 L3 Practice with Proportions Lesson.notebook Solve for the variable in each of the proportions below. a) b) Cross Product

U6 L3 Practice with Proportions Lesson.notebook