Find a parametric equation for the parabola described.Vertex at (1, 3); directrix y = 1
A. x = 
t2 - 3, y = t - 1
B. y = 
t2 - 3, x = t - 1
C. x = 
t2 + 3, y = t + 1
D. y = 
t2 + 3, x = t + 1
Answer: D
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