April 07, 2016
9.5 Division in Equations and Inequalities
Solve
45x=20
Division Property of Equality
If a = b and c ≠ 0, then a/c = b/c
April 07, 2016
Example 1
High Mountain breakfast-blend coffee beans are selling at $6.78 a
pound. If you bought some coffee beans and paid $16.95, how many
pounds did you buy?
A mechanic charges $35 per hour. After working on a car, the mechanic
presented a bill for $134.17. How long did the mechanic work on the
car?
April 07, 2016
Division Property of Inequality
For any real numbers x and y: if x < y and a is positive, then
x/a < y/a
For any real numbers x and y: if x < y and a is negative, then
x/a > y/a
Example 2
The weight of a sheet of paper is about 0.17 ounce. A book cover weighs
about 8 ounces. If a book can weigh no more than 6 pounds, how many
pages can the book have?
April 07, 2016
The thickness of a sheet of paper in a book is 0.00625 inch and the
thickness of each of the front and back covers is 1.525 inches thick,
how many sheets of paper does it contain?
April 07, 2016
Homework:
9.5B