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

- anonymous

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

- Stacey Warren - Expert brainly.com

Hey! We 've verified this expert answer for you, click below to unlock the details :)

- katieb

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

- anonymous

i've tried to do this at least 5 times. i don't understand it at all

- mathslover

|dw:1337656235090:dw|

- mathslover

|dw:1337656263685:dw|

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

- mathslover

|dw:1337656308816:dw|

- anonymous

or multiply the second equation by -4

- mathslover

|dw:1337656338440:dw|

- mathslover

|dw:1337656365038:dw|

- mathslover

|dw:1337656398578:dw|

- anonymous

\[4x^2+9y^2=72\]
\[-4(x^2-y^2)=-4(5)\]

- mathslover

|dw:1337656433069:dw|

- anonymous

there's supposed to be 2 solutions:
The solutions are:
(_,_) & (_,_)

- anonymous

\[4x^2+9y^2=72\]
\[-4x^2+4y^2=-20\]
add them together to get
\[13y^2=52\]

- anonymous

trust me, i've gotten all the solutions possible. but the answer is still wrong.

- anonymous

\[y^2=\sqrt{\frac{52}{13}}\]

- mathslover

the solutions are : sqrt(52/11) and sqrt(107/11)

- anonymous

but there's 4 solutions.

- mathslover

@ outkast i think y = sqrt(52/11) u wrote y^2 = sqrt(52/13) ?

- anonymous

yeah i think there might be aproblem with your's mine is correct i thinkkk let me check

- anonymous

yeah mine is correct .. by elimination

- mathslover

u can write it as : |dw:1337656633671:dw|

- radar

\[y=\pm2\]\[x=\pm3\]

- anonymous

i also got that ^

- anonymous

i'ma cheat *grabs calculator

- anonymous

lol, i've done that too! ^

- anonymous

ahh wait mathslover you have 7 instead of 9

- mathslover

hey sorry , i took 4x^2 + 7y^2 but it is 4x^2 + 9y^2 , therefore the 4 solutions are : |dw:1337656820684:dw|

- anonymous

i believe you made a 9 really badly and thought it was a 7
the first equation is
4x^2+9y^2=72

- anonymous

For y, I got y= +/- sqrt (52/13)

- anonymous

thats right now for x

- mathslover

yes sorry , y = + 2 , -2
x = +3 , -3

- mathslover

@Outkast3r09 x = +3 , -3 right ?

- anonymous

\[x^2-(2^2)=5\]
\[x^2-(-2^2)=5\]

- anonymous

x = +/- 3

- anonymous

\[x^2-4=5\]
\[x^2-4=5\]

- radar

\[\sqrt{52/13}=\pm2\]\[x ^{2}=9\]\[x=\pm3\]

- anonymous

I was slow, I was using a crappy calculator.

- anonymous

does this mean it's a multiplicity of 2?

- anonymous

@thejoshfish did you try putting in y= +/- sqrt (52/13) and x=+/- 3?

- anonymous

@Outkast3r09 it means 3*3 and (-3)(-3).

- anonymous

i sure did. haha trust me, i tried everything. i'm so fed up.
but you guys are wonderful.

- anonymous

those are your answers are you using like owl or whatever

- anonymous

owl?

- anonymous

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.

- anonymous

Online web learning

- anonymous

what does it say the answers are josh?

- anonymous

alpha omega academy

- anonymous

it doesn't tell me. but thanks for helping.

- anonymous

sometimes those sites have like a function button with like +- and what not . that could be the problem
or try 3,-3 , -2 ,2

- anonymous

If you have to take the higher level physics series, they might make you use MasteringPhysics. Have fun with that! Groans.

Looking for something else?

Not the answer you are looking for? Search for more explanations.