Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 10 - Section 10.1 - Systems of Linear Equations in Two Variables - 10.1 Exercises - Page 689: 59

Answer

Required numbers are $22$ and $12$.

Work Step by Step

Let''s assume that one number is '$x$' and another is '$y$' and $x\gt y$. Therefore according to problem- $x+y$ = $34$ __eq.1 $x-y$ = $10$ __eq.2 Adding eq.1 and eq.2- $x+y+x-y$ = $34+10$ i.e. $2x$ = $44$ i.e. $x$ = $\frac{44}{2}$ = $22$ Substituting for '$x$' in eq.1- $22+y$ = $34$ i.e. $y$ = $34-22$ = $12$ Therefore the two numbers are $22$ and $12$.
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