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Mathematics 19 Online
OpenStudy (anonymous):

PLS HELP ME!

OpenStudy (anonymous):

write an equation of a parabola with the given focus and directrix focus:(0,3); directrix:y=-1

OpenStudy (phi):

can you plot the focus and the directrix ?

OpenStudy (anonymous):

@phi how do u do that

OpenStudy (phi):

for the focus at (0,3) you put a point a the spot where x is 0 and y is 3

OpenStudy (anonymous):

@phi then what do i do

OpenStudy (phi):

graph the directrix y=-1 this is a line. can you do that can you show what you got so far ?

OpenStudy (anonymous):

but it doesnt want a graph just an equation r u sure there isnt an easier way

OpenStudy (phi):

You can do this with algebra, but drawing it will make some of it easier to figure out. Can you plot the line y= -1 ?

OpenStudy (anonymous):

h|dw:1363285021280:dw|

OpenStudy (anonymous):

this right?

OpenStudy (anonymous):

@phi

OpenStudy (phi):

yes. let's add the focus |dw:1363285139913:dw|

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