Transcript Multiplication Property of Inequality

To solve inequalities using multiplication and division:
EXCEPT WHEN YOU . . .
Use normal algebra skills and bring
down inequality symbol
Multiply or divide by a negative
*Reverse the inequality symbol
REMEMBER! x needs to be on the left to graph
Solve each inequality. Graph and check your solution.
Multiply each side by the same value.
*Reverse the inequality if you multiply by a negative.
Multiplication Property of Inequality:
1.
2.
Divide each side by the same value.
*Reverse the inequality if you divide by a negative.
Division Property of Inequality:
3.
4.
What’s that you say?

SWITCH, SWITCH, SWITCH THE SIGN …
SWITCH THE INEQUALITY!!
Define a variable and write an inequality from the scenarios below to solve the problem.
5. Students in the school band are selling calendars. They earn $.40 on
each calendar they sell. Their goal is to earn more than $327. What is
the fewest number of calendars they can sell and still reach their goal?
6. The student council votes to buy food for a local food bank. A case of 12 jars
of spaghetti sauce costs $13.75. What is the greatest number of cases of
sauce the student council can buy if they use at most $216 for this project?
7. Suppose you earn $6.15 per hour working part time at a dry cleaner.
How many hours must you work to earn at least $100?