Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1 - Introduction to Algebraic Expressions - 1.1 Introduction to Algebra - 1.1 Exercise Set - Page 11: 84



Work Step by Step

Evaluate $\frac{x+y}{2}$ when y is twice x and x is 6. Write an expression for y in terms of x. $y=2x\longrightarrow$ Substitute for x to find y. $y=2(6)=12$ $\frac{x+y}{2}=\longrightarrow$ Substitute for x and y in the original formula. $\frac{6+12}{2}=\longrightarrow$ Solve $\frac{18}{2}=$ $9$
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