What is the equation of the directrix of the parabola having a vertex at (6,0), passing through (2,1) and whose axis is parallel to the y-axis?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.3: Hyperbolas
Problem 41E
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2. What is the equation of the directrix of the parabola having a vertex at (6,0), passing through (2,1) and whose axis is parallel to the y-axis?

a. y + 4 = 0

b. y - 4 = 0

c. x + 4 = 0

d. x - 4 = 0

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