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 - 9.2 Graph and Write Equations of Parabolas - 9.2 Exercises - Skill Practice - Page 623: 22


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Work Step by Step

The equation in standard form: $-5x+\frac{1}{3}y^2=0\\x^2=-\frac{12}{5}y$ Identify the focus, directrix, and axis of symmetry. The equation has the form $y^2=4px$ where $p=\frac{15}{4}$. The focus is $(\frac{15}{4},0)$. The directrix is $x =-p=\frac{-15}{4}$. Because $y$ is squared, the axis of symmetry is the x-axis. Find some values and plot points: $x=1 \rightarrow y=\pm 3.87\\x=2 \rightarrow y=\pm 5.48\\x=3 \rightarrow y=\pm 6.71\\x=4 \rightarrow y=\pm 7.75\\x=5 \rightarrow y=\pm 8.66$
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