Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 11 - Section 11.2 - Ellipses - 11.2 Exercises - Page 798: 60

Answer

$(\frac{60}{13}, \pm\frac{60}{13})$, $(-\frac{60}{13}, \pm\frac{60}{13})$

Work Step by Step

Step 1. Subtract the first equation from the second, we get $119(x^2-y^2)=0$, thus $y^2=x^2$ or $y=\pm x$ Step 2. The first equation becomes $169x^2=3600$ so that $x=\pm\frac{60}{13}$ Step 3. State the 4 intersection points: $(\frac{60}{13}, \pm\frac{60}{13})$, $(-\frac{60}{13}, \pm\frac{60}{13})$ Step 4. Graph the equations and label the intersection points as shown.
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