hyperbolas
find an equation in standard form for the hyperbola with vertices at (0.+-4) and asymptotes at y=+-2/3x
chart was not helpful ?
I think the first step would be to figure out whether the required hyperbola is horizontal or vertical
so its y^2/4^2 -x^2/... idk what that ones over .-.
try to sketch it |dw:1403210061612:dw|
Excellent ! look at the last row in the chart
asymptotes are \(\large y = \pm\dfrac{a}{b} x =\pm\dfrac{2}{3}x \)
\(\large \implies \dfrac{a}{b} = ?\)
oh so b is 3 so its y^2/4-x^2/9
thats clever :) but no !
\(\large \dfrac{a}{b} = \dfrac{2}{3}\)
you already knw the value of \(\large a\), so plug it in and solve \(\large b\)
but :c b it 3..... it says so right there a/b=2/3..... so its y^2/9-x^2/2
\(\large a = 4\) since the vertices are (0, +-4) \(\large \dfrac{4}{b} = \dfrac{2}{3} \implies b = 6\)
the equation would be \(\large \dfrac{y^2}{4^2} - \dfrac{x^2}{6^2} = 1\)
okay so itd be y^2/16-x^2/36=1
yes.. and you may verify it quick by finding the vertices and asymptotes (use the chart)
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