Answer
If I substitute the value that I found for $a$ into both expressions and check that the expressions simplify to the same value, that will show that I solved the equation correctly.
Work Step by Step
$a=6$
$5(6)+12= 42$
$9(6)-12= 42$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 1 - Tools of Geometry - 1-3 Measuring Segments - Apply What You've Learned - Page 26: c
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