Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 9 - Section 9.2 - Solving Pairs of Linear Equations by Addition - Exercises - Page 332: 14

Answer

$(\frac{13}{7},\frac{2}{7})$

Work Step by Step

The given pair of linear equations are. $6x-4y=10$ ..... (1) $2x+y=4$ ...... (2) Multiply equation (2) by $4$. $8x+4y=16$ ..... (3) Add equation (1) and (3). $\Rightarrow 6x-4y+8x+4y=10+16$ Simplify. $\Rightarrow 14x=26$ Divide both sides by $14$. $\Rightarrow x=\frac{26}{14}$ Simplify. $\Rightarrow x=\frac{13}{7}$ Substitute the value of $x$ into equation (2). $\Rightarrow 2(\frac{13}{7})+y=4$ Simplify. $\Rightarrow \frac{26}{7}+y=4$ Isolate $y$. $\Rightarrow y=4-\frac{26}{7}$ Simplify. $\Rightarrow y=\frac{28}{7}-\frac{26}{7}$ $\Rightarrow y=\frac{28-26}{7}$ $\Rightarrow y=\frac{2}{7}$ Hence, the ordered pair of the point of intersection is $(x,y)=(\frac{13}{7},\frac{2}{7})$.
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