SOLUTION: What is the axis of symmetry of the parabola with the equation x – 4 = 1/4(y + 1)2

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Question 416655: What is the axis of symmetry of the parabola with the equation x – 4 = 1/4(y + 1)2
Answer by Gogonati(855) About Me  (Show Source):
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We write this equation in the form; (y+1)^2=4(x-4) and conclude that;
The vertex is (4,-1) and directrix (4c=4; c=1)is x=-1.
The axis of symmetry is perpendicular to directrix with equation; y=-1.