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Ratio and Proportion
c d
a b =
proportion: two ratios that are equal to each other.
cross products of proportions are equal
(b)(c) = (a)(d)
Review:
23
3w=
Solve for each variable.
10 y
2y 5=1.)
2.)
You must check for solutions that would not work. Any value of "x" that makes the denominator zero is undefined. This is called an extraneous solution.
-3 d
d - 3 2d
=x + 3 4
x5
=3.) 4.)
x + 3x + 5
x - 3 -5
= 2x - 3 4x
x - 1 x
=5.) 6.)
Demonstrate Understanding:
1.) 2.)
3.)
4.)
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