Math Is Fun Forum

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

oh okay, well glad some one saw it. So what do I do now?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

y - 0 = -( x - 0 )

Now simplify.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

should i cancel the zeroes out?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Yes, you can.

y - 0 = -( x - 0 )

y = - x

0 = - x - y Now you can move them both over to the left to get:

x + y = 0 This works for both points.

0 + 0 = 0 True

4 + ( - 4 ) = 0 True

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Hey, I have more math like this, can you give me a hand?

My points are this: (0 , 6) , (6 , 0)

I tried to find the slope and heres my work:

Slope = M
M = (y2 - y1) / (x2 - x1)
M= (0 - 6) / (6 - 0)
M= -6 / 6
M= - 1

How am I looking so far?

If by some chance, my slope is right, my next equation would be:
*using (0 , 6)*
(y - 6) = -1(x - 6)
Given that I'm okay so far, what do I simplify it to?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Okay your slope is okay, and we use little m for slope. Capitals are for generally matrices.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

oh okay sorry, do you want me to go back and edit that?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

No, in the future do it like that. The equation of course is not right. Do you see why?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Sorry, no. What did I do wrong?

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Of Moons, Birds and Monsters

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Area problems Please Help!!

Tiny Correction:
not subtract 6 in both places, subtract zero in one place:
*using (0 , 6)*
(y - 6) = -1(x - 0)
y - 6 = -x + 0
y = -x + 6
done.

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igloo myrtilles fourmis

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Yep, you used 6 twice. It doesn't like that. Now check that to see if it goes through your points. After you have worked it into your form.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Oh I used x1 - x2 instead of the other wat around!! Thats what I did... what a dork.

So all I do is rearange them now?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Yes and check, remember?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Check like this:

( 0 + 6) = 6

(6 + 0) = 6

6 = 6?

So x - y = 6 is true?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

And the other point? Do you see you have made an error? You have manipulated John's answer incorrectly.

y = -x + 6

y + x = 6 is correct. You have x - y = 6!

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Oh okay, I used a - instead of the +

Wait how did it end up as a + in the first place? My math is all screwed up...

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Do you understand this answer y = -x + 6

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

and also, on the problem itself it has an answer box that looks like this:

x________

The X has to be in front! What did I do?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Do you understand this answer y = -x + 6

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

um yeah I think so..?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

You got it from the point slope formula remember? Post # 210

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

yeah. the (y - 6) = -1(x - 0)?

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

Can you solve to become:y = -x + 6

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

misheeru

Member

Registered: 2010-02-18

Posts: 4,594

Re: Area problems Please Help!!

Well yeah, if I follow John's example. If I hadn't messed up the points the 1st time I probably could have gotton close, maybe.

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Of Moons, Birds and Monsters

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Area problems Please Help!!

y = -x + 6

y + x = 6 This is the equation.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.