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 688: 12


$x=1$ $y=4$

Work Step by Step

$2x-5y=-18\rightarrow$ Multiply by 3. $3x+4y=19\rightarrow$ Multiply by -2. $6x-15y=-54$ $-6x-8y=-38 \rightarrow$ Add the equations to eliminate x. $-23y=-92$ $y=4$ Substitute for y and solve for x. $2x=-18+20$ $x=1$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.