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 8 - Systems of Linear Equations and Problem Solving - 8.2 Solving by Substitution or Elimination - 8.2 Exercise Set - Page 516: 20

Answer

$(4,-1)$

Work Step by Step

Isolate $x$ in eq.$2$ $-3y+x=7\qquad$ ... add $3y$ $x=7+3y\qquad $(*) Replace $x$ with $7+3y$ in the other equation: $ 5(7+3y)+6y=14\qquad$ ... and solve for $y$. Simplify $35+15y+6y=14$ $ 21y+35=14\qquad$ ... subtract 35 $21y=-21$ $y=-1$ Now, back-substitute into (*) $x=7+3(-1)=4$ Form an ordered pair $(x,y) $ as the solution to the system $(4,-1)$
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