Algebra 1

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

Chapter 2 - Solving Equations - 2-1 Solving One-Step Equations - Practice and Problem-Solving Exercises - Page 86: 71



Work Step by Step

We are give the equation $-36= \frac{x}{9}$ and in the wrong answer they multiply each side by 1/9 in an attempt to cancel out the nine below the x, what this really does is give us the equation $-4= \frac{x}{81}$ . If we look back at the original equation we know we need to multiply the numerator by 9 to find x. $$9\times-36=9\times\frac{x}{9}$$ This gives us: $$-324= x$$ or $$x=-324$$
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