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Mathematics 15 Online
OpenStudy (lovelyharmonics):

hyperbolas

OpenStudy (lovelyharmonics):

find an equation in standard form for the hyperbola with vertices at (0.+-4) and asymptotes at y=+-2/3x

ganeshie8 (ganeshie8):

chart was not helpful ?

ganeshie8 (ganeshie8):

ganeshie8 (ganeshie8):

I think the first step would be to figure out whether the required hyperbola is horizontal or vertical

OpenStudy (lovelyharmonics):

so its y^2/4^2 -x^2/... idk what that ones over .-.

OpenStudy (ikram002p):

try to sketch it |dw:1403210061612:dw|

ganeshie8 (ganeshie8):

Excellent ! look at the last row in the chart

ganeshie8 (ganeshie8):

asymptotes are \(\large y = \pm\dfrac{a}{b} x =\pm\dfrac{2}{3}x \)

ganeshie8 (ganeshie8):

\(\large \implies \dfrac{a}{b} = ?\)

OpenStudy (lovelyharmonics):

oh so b is 3 so its y^2/4-x^2/9

ganeshie8 (ganeshie8):

thats clever :) but no !

ganeshie8 (ganeshie8):

\(\large \dfrac{a}{b} = \dfrac{2}{3}\)

ganeshie8 (ganeshie8):

you already knw the value of \(\large a\), so plug it in and solve \(\large b\)

OpenStudy (lovelyharmonics):

but :c b it 3..... it says so right there a/b=2/3..... so its y^2/9-x^2/2

ganeshie8 (ganeshie8):

\(\large a = 4\) since the vertices are (0, +-4) \(\large \dfrac{4}{b} = \dfrac{2}{3} \implies b = 6\)

ganeshie8 (ganeshie8):

the equation would be \(\large \dfrac{y^2}{4^2} - \dfrac{x^2}{6^2} = 1\)

OpenStudy (lovelyharmonics):

okay so itd be y^2/16-x^2/36=1

ganeshie8 (ganeshie8):

yes.. and you may verify it quick by finding the vertices and asymptotes (use the chart)

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