Answer
not true if $c= $0
Work Step by Step
let $a= $1
$b= $2
$c= $0
$a\times $c = 0
$1\times $0=0
$b\times$c = 0
$2\times$0=0
thus
$a\times $c = $b\times $c
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Appendix A - A.3 - Inequalities - Exercises - Page 545: 30
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