Solve: 3 m 48
3 m 3 48 3
m 16
Check: 3( 16 ) 48
48 48 True
?
Solve: 7 f 13 90
7 f 13 13 90 13
7 f 77
7 f 7 77 7
f 11
Check: 7( 11 ) 13 90
90 90 True
?
Multiplication and Division
Equations with Integers
14-3
Over a 9-month period, Gina’s stocks
showed an average loss of $16 per month.
What was the total loss in Gina’s stocks for
that 9-month period?
To find the total amount, write and solve
an equation.
Let trepresent the total loss.
9 t $16
- 9 $16• 9
t$144
t
9
Check: $16
$144
9
$16$16 True
The total loss for Gina’s stocks over a
9-month period was $144.
Study these examples.
total loss divided by number of months equals average loss
t 9 $16 or t 9 $16
Multiply both sides by 9.
?
Substitute $144 for t.
solution
Remember:
The product or quotient of two
integers having the same sign
is positive.
The product or quotient of two
integers having different signs
is negative.
1.1
8206-2_500-501 10/7/07 12:29 PM Page 500