Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Appendix A - The Language of Mathematics - Exercises - Page A6: 19


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Work Step by Step

First, the converse is If $x + y \gt 8$ then $x \gt 4$ and $y \gt 4$. The counterexample is $x=1$ and $y=9$. Then, we have: $1+9\gt 8$ and $1\lt 4$.
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