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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
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.
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
U6 L3 Practice with Proportions Lesson.notebook