Parabolas Answers
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Which graph represents the function y2 = −16x?
A
[Image: On a coordinate plane, a parabola opens to the lef...]
B
[Image: On a coordinate plane, a parabola opens to the lef...]
C
[Image: On a coordinate plane, a parabola opens up. It has...]
D
[Image: On a coordinate plane, a parabola opens down. It h...]
1
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The parabola has a focus at (−3, 0) and directrix x = 3. What is the correct equation for the parabola?
A
x2 = −12yB
x2 = 3yC
y2 = 3xD
y2 = −12x1
Which statements are true for the equation x2 = −4y? Check all that apply.The axis of symmetry is x = 0.The focus is at (0, –1).The parabola opens up.The parabola opens right.The value of p = −1.The equation for the directrix is y = 0.
A
The axis of symmetry is x = 0.B
The focus is at (0, –1).C
The parabola opens up.D
The parabola opens right.E
The value of p = −1.F
The equation for the directrix is y = 0.1
If the directrix of a parabola is the horizontal line y = 3, what is true of the parabola?
A
The focus is at (0, 3), and the equation for the parabola is y2 = 12x.B
The focus is at (0, –3), and the equation for the parabola is x2 = –12y.C
The focus is at (3, 0), and the equation for the parabola is x2 = 12y.D
The focus is at (–3, 0), and the equation for the parabola is y2 = –12x.Did you find these answers helpful?
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