Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Exercise Set - Page 66: 10

Answer

$x=17$ $y=41$

Work Step by Step

Step 1. Let $x$ and $y$ be the two numbers. $x$ = the first number $y$ = the second number Step 2. Represent other unknown quantities in terms of the other. Hence, the phrase, "One number exceeds another by 24" --> $x+24=y$ The sum of the numbers is 58 --> $x+y=58$ Step 3. Write the equations that model the conditions. $x+24=y$ -->equation 1 $x+y=58$ -->equation 2 Step 4. Solve the equation and answer the question. Substitute equation 1 to equation 2: $x+(x+24)=58$ $x+x+24=58$ $2x+24=58$ Subtract 24 to both sides: $2x+24-24=58-24$ $2x=34$ Divide both sides by 2: $x=17$ Substitute to equation 1: $x+24=y$ $17+24=y$ $y=41$ Step 5. Check the proposed solution in the original wording of the problem. Use equation 2: $x+y=58$ $17+41 = 58$ $58=58$ --> TRUE
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