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15 Cards in this Set
- Front
- Back
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x+y=7
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line
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y=x^2 +1
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parabola
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2x^2 + 3y^2 = 18
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ellipses
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2x^2 + 2y^2 = 20
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circle
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write an equation in graphing form
parabola: vertex (0,0) has a vertical axis, and passes through (5,-10) |
x^2=-5/2y
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(x-h)^2/a^2 + (y-k)^2/b^2 = 1
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standard form of ellipses
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foci equation when A is under the x
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(h+/-c,k)
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foci equation when A is under the y
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(h,k+/-c)
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eccentricity
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c/a
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length of major
length of minor |
2a
2b |
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(x-h)^2=4a(y-k)
or y= 1/4a (x-h)^2 + k |
standard form of parabolas
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(h,k+a)
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focus when its y=
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(h+a,k)
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focus when x=
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y= k-a
x= h-a |
directrix
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(x-h)^2+(y-k)^2=r^2
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standard form of a circle
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