Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - 6.3 Applications of Linear Equations - Exercise Set 6.3 - Page 376: 67


The statement:“I solved a formula for one of its variables, so now I have a numerical value for that variable” does not make sense

Work Step by Step

One variable is not sufficient when there is more than one variable is there. e.g. \[\begin{align} & x=10y+20z \\ & y=5x+10z \\ & z=x+y \\ \end{align}\] In this case we need to solve all three variables to get the solution. One variable is not sufficient to solve this equation. Hence, the provided statement does not make sense.
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