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: 7

Answer

x = 3 y = 1

Work Step by Step

1. Solve the equation x - y = 2 for variable x 2. Solving for variable x gives the equation x = y + 2 3. Now plug in y + 2 into x for the second equation 2x + 3y = 9 4. Plugging y + 2 for x gives the equation 2(y + 2) + 3y = 9 5. Simplifying 2(y + 2) + 3y = 9 gives 5y = 5 6. Solving for y gives you y = 1 7. To find X, plug in y as 1 into either equation 8. If plugging into first equation, you get x - 1 = 2 9. Solving for x gives you 3
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