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Solve the following system. 4x^2 + 9y^2 =72 x^2 - y^2 = 5 The solutions are?

Mathematics
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i've tried to do this at least 5 times. i don't understand it at all
|dw:1337656235090:dw|
|dw:1337656263685:dw|

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Other answers:

|dw:1337656308816:dw|
or multiply the second equation by -4
|dw:1337656338440:dw|
|dw:1337656365038:dw|
|dw:1337656398578:dw|
\[4x^2+9y^2=72\] \[-4(x^2-y^2)=-4(5)\]
|dw:1337656433069:dw|
there's supposed to be 2 solutions: The solutions are: (_,_) & (_,_)
\[4x^2+9y^2=72\] \[-4x^2+4y^2=-20\] add them together to get \[13y^2=52\]
trust me, i've gotten all the solutions possible. but the answer is still wrong.
\[y^2=\sqrt{\frac{52}{13}}\]
the solutions are : sqrt(52/11) and sqrt(107/11)
but there's 4 solutions.
@ outkast i think y = sqrt(52/11) u wrote y^2 = sqrt(52/13) ?
yeah i think there might be aproblem with your's mine is correct i thinkkk let me check
yeah mine is correct .. by elimination
u can write it as : |dw:1337656633671:dw|
\[y=\pm2\]\[x=\pm3\]
i also got that ^
i'ma cheat *grabs calculator
lol, i've done that too! ^
ahh wait mathslover you have 7 instead of 9
hey sorry , i took 4x^2 + 7y^2 but it is 4x^2 + 9y^2 , therefore the 4 solutions are : |dw:1337656820684:dw|
i believe you made a 9 really badly and thought it was a 7 the first equation is 4x^2+9y^2=72
For y, I got y= +/- sqrt (52/13)
thats right now for x
yes sorry , y = + 2 , -2 x = +3 , -3
@Outkast3r09 x = +3 , -3 right ?
\[x^2-(2^2)=5\] \[x^2-(-2^2)=5\]
x = +/- 3
\[x^2-4=5\] \[x^2-4=5\]
\[\sqrt{52/13}=\pm2\]\[x ^{2}=9\]\[x=\pm3\]
I was slow, I was using a crappy calculator.
does this mean it's a multiplicity of 2?
@thejoshfish did you try putting in y= +/- sqrt (52/13) and x=+/- 3?
@Outkast3r09 it means 3*3 and (-3)(-3).
i sure did. haha trust me, i tried everything. i'm so fed up. but you guys are wonderful.
those are your answers are you using like owl or whatever
owl?
Talk with your instructor. I'm taking statics and have the instructor's manual. They're wrong way more times than I'd like them to be. I think the grad students who write the manuals aren't getting enough sleep.
Online web learning
what does it say the answers are josh?
alpha omega academy
it doesn't tell me. but thanks for helping.
sometimes those sites have like a function button with like +- and what not . that could be the problem or try 3,-3 , -2 ,2
If you have to take the higher level physics series, they might make you use MasteringPhysics. Have fun with that! Groans.

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