THINK AND DISCUSS
1. Use algebra to explain why equal cross products imply that two ratios
are equal.
2. How is it possible to find a length
or distance without physically
measuring it?
*Àœ«œÀ̈œ˜Ã
3. GET ORGANIZED Copy and complete
the graphic organizer. In each box, write
examples of each item that relate to the
concept of proportion.
2-2
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*Àœ«œÀ̈œ˜Ã
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Exercises
KEYWORD: MB7 2-2
KEYWORD: MB7 Parent
GUIDED PRACTICE
1. Vocabulary Miles per hour is a(n) ? . (rate, ratio, or indirect measurement)
−−−
SEE EXAMPLE
1
p. 97
Solve each proportion.
n
6.4 = _
2
2 =_
2. _
3. _
x
13 52
3
8 =_
5
6. _
x
12
SEE EXAMPLE
11. Travel Jesse drove from Los Angeles to Las Vegas, a distance of 463 km. He used
12 gal of gas on the trip. Find the gas mileage in miles per gallon of Jesse’s car. (Hint:
1 km ≈ 0.62 mi)
p. 98
5
12. Geometry ABC has vertices A(0, 0), B(0, 8), and C(-6, 8). ADE is similar to
ABC with a vertex at D(0, 4). Graph ABC and ADE on the same grid.
13. Surveying A surveyor
uses similar triangles to
measure the distance
across a canyon. What is
the distance across the
canyon, according to the
diagram?
? ft
22 ft
15 ft
100
63
x =_
9. _
-15 45
3
SEE EXAMPLE 4
p. 99
18
-2 = _
8. _
x
5
10. School A college brochure claims that 24% of the students attending the college
are majoring in business. If there are 420 students at the college who are majoring in
business, how many students are attending the college?
p. 98
SEE EXAMPLE
6
3
5. _
=_
t
3
2
p. 98
SEE EXAMPLE
x
4 =_
7. _
9 45
1
__
4 =_
24
4. _
x
14
77 ft
Chapter 2 Linear Functions
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