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: 9

Answer

x = 2 y = 1

Work Step by Step

1. First figure out what variable you want to cancel out first 2. Since the y variables have opposing signs on both equations, adding the 2 equations would be the easiest route to cancel both the 4Y and -4Y 3. Adding the equations together gets you 4X = 8 4. Solving for X gives you X = 2 5. Plug in X = 2 into the first or second equation 6. Using wither equation, you should be getting y = 1
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