Page 45 - Math Course 1 (Book 2)

Linear Equations: Multiplication and Division

Real World Example Solve Using Multiplication by a Fraction

1
SPACE TRAVEL Solve (4 ) m = 5 3
7
3
On July 20, 1969, Neil Armstrong stepped on the
surface of the Moon. On the Moon, his suit and 23
life-support backpacks weighed about 33 pounds. A. 1 91
An item’s weight on the Moon is about one sixth 2
its weight on Earth. What would be the weight of B. 6 7
Neil Armstrong’s suit and life-support backpacks 2
on Mars if three times the Mars weight equals the C. 1 21
Earth weight?
D. 5
33 pounds
(weight on moon) Answer
x 6 = 198
(weight on Earth)

Words Three times the weight on Mars Solve 32 = –14c.
equals the weight on Earth.
A. –3
Variables Let w = the weight on Mars.
B. 46

Equation 3 × w = 198 C. 18
2
D. –2
7
3w = 198 Original equation
Answer

Multiply each side by

w = 66
Real World Example
The weight of Neil Armstrong’s
Answer suit and life-support backpacks Refer to the information about Neil Armstrong in
on Mars would be 66 pounds. Example 3. If Neil Armstrong weighed 216 pounds
on Earth, how much would he weigh on Mars?

A. 216 pounds
B. 140 pounds
Your Turn! C. 72 pounds
D. 282 pounds
Solve Using Multiplication by a Positive Number
a 2
Solve = Answer
18 3

A. 12
B. 36
C. 27
D. 18

Answer

37