Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 9 Quadratic Relations and Conic Sections - 9.7 Solve Quadratic Systems - 9.7 Exercises - Skill Practice - Page 662: 23



Work Step by Step

Adding the first and negative $25$ times the second equation we get: $5x^2+25x-125+125=0\\5x^2+25x=0\\x^2+5x=0\\x(x+5)=0$ Thus $x=0$ or $x=-5$ $y^2=5+x$ thus if $x=0$, then $y=\pm\sqrt{5}$ and if $x=-5$ then $y=0$. Thus the solutions are: $(-5,0)(0,\sqrt5),(0,-\sqrt5)$
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