# For A Girl Who Needed Help On An Algebra assignment

Here's how x=y

and how x=2

and y=2

### Chapter 1

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She says the problem is:

12-x^2 -2xy = 0Â

12-y^2 - 2xy = 0Â

BOTH ARE EqUAL to 0

12-x^2 - 2xy=12-y^2 - 2xy

ADD 2xy to each side, and subtract 12 -- then divide each side by -1 and you get:Â

x^2=y^2

notice how if we square root both of those x=y

so now go back and use one of those equations ---

12-x^2 -2xy = 0

Now plug in "x" for "y" -- and

12-x^2-2x^2=0

12-3x^2=0

-3x^2=-12

x^2=4

x=2

y=2

12-x^2 -2xy = 0Â

12-y^2 - 2xy = 0Â

BOTH ARE EqUAL to 0

12-x^2 - 2xy=12-y^2 - 2xy

ADD 2xy to each side, and subtract 12 -- then divide each side by -1 and you get:Â

x^2=y^2

notice how if we square root both of those x=y

so now go back and use one of those equations ---

12-x^2 -2xy = 0

Now plug in "x" for "y" -- and

**LOOK:**12-x^2-2x^2=0

12-3x^2=0

-3x^2=-12

x^2=4

x=2

y=2

## 14 Comments

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4y-7+1=22

y=7

4y-7+1=22

add 1 to negative 7 u get negative 6

4y-6=22

add 6 to both sides

4y=28

divide by 4

y=7

...What? How can y=2 and x= a weird smiley face and then... Ok, you lost me...

What? I don't get it.... I hate math and i'm in pre-alg soooo I'm a little confused sorry :P

uhhh i wasnt the one who needed help... haha but uh thanks for sending it to me! Im in algebra one but i dont get the ^'s and the square root part.. i dont think ive learned that yet. but again im only in the eigth grade. If i knew the problem and wat they wanted then maybe id be able to figure it out.

^ means to the power of seeing as we can make the text go smaller and higher when we're typing...

i have nothing to say

algebra? sry im in pre-algebra... I guess this is a headstart on wat ima have 2 learn. :) thnx!!!!!!

hm nice

If you don't mind me asking... what year/form/whatever it's called in your country algebra is this?

That's cool, here's another way of looking at it;

12-x^2-2xy=0

12-y^2-2xy=0

Therefore, x=y

12-x^2-2xy=12-x^2-2x^2=12-3x^2

Therefore, 12/3=x^2

12/3=4

âˆš4=2

x=2, y=2

whaaaa? i don't get it lol