Chapter 9 Quadratic Relations and Conic Sections - 9.4 Graph and Write Equations of Ellipses - 9.4 Exercises - Skill Practice - Page 638: 41

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Given: $\frac{x^2}{75}+\frac{4y}{25}=0$ Identify the focus, directrix, and axis of symmetry. The equation has the form $x^2=4py$ where $p=-3$. The focus is $(0,-3)$. The directrix is $x =-p=3$. Because $x$ is squared, the axis of symmetry is the y-axis.