Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 13 - Section 13.3 - Solving Nonlinear Systems of Equations - Exercise Set - Page 949: 41

Answer

$$x = 7, y = 9$$

Work Step by Step

Writing the equation: $x^{2} + y^{2} = 130$ (equation 1) $x^{2} - y^{2} = 32$ (equation 2) Simultaneously solving the equation will eliminate the term $y^{2}$, which will yield an equation: $$2x^{2} = 98$$ Divide both sides by two: $$\frac{2x^{2}}{2} = \frac{98}{2}$$ $$x^{2} = 49$$ $$x = 7$$ Substituting to equation 1: $$x^{2} + y^{2} = 130$$ $$7^{2} + y^{2} = 130$$ $$49 + y^{2} = 130$$ Subtract $49$ to both sides: $$49 -49+ y^{2} = 130-49$$ $$y^{2} = 81$$ $$y = 9$$
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.