Vertical and Horizontal Tangent Lines In Exercises 67and 68, find the points at which the graph of the equation hasa vertical or horizontal tangent line.67. 25x2 + 16y2 + 200x − 160y + 400 = 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
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Vertical and Horizontal Tangent Lines In Exercises 67
and 68, find the points at which the graph of the equation has
a vertical or horizontal tangent line.
67. 25x2 + 16y2 + 200x − 160y + 400 = 0

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