Answer
y=3
x=-1
Work Step by Step
Solve for x in the second equation
x=y-10
Substitute for x in the first equation and then solve for y.
7(3y-10)-y=-10
21y-70-y=-10
20y=60
y=3
Substitute y=3 in the equation for x.
x=3(3)-10
x=-1
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 5 - Section 5.1 - Systems of Linear Equations - 5.1 Exercises - Page 486: 13
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