Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 3 - Solving Inequalities - 3-3 Solving Inequalities Using Multiplication or Division - Practice and Problem-Solving Exercises: 30

Answer

$x\lt-11$
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Work Step by Step

$-12x\gt132\longrightarrow$ divide both sides by -12; reverse the inequality sign $-12x\div-12\lt132\div-12\longrightarrow$ divide $x\lt -11$ Check the inequality. Choose any number less than -11 and substitute for x. $-12(-20)\overset?\gt132$ $240\gt132\checkmark$ Since -11 is not included in the solution, the endpoint of the graph is an open circle.
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