i need help with an algebra question.

the directions only say Solve

6n-3(7a+8)=27n
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its called distributive property of multiplication, and substitution; you have to solve for one variable and then plug that back in to solve, then just solve.
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6n-21a+-24=27n

now solve for that i dont feel like helping anymore
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6n-3(7a+8)=27n

-3(7a +8) = 27n-6n
-21a - 24 = 21
-21a = 21 + 24
-21a= 45
---- ---
-21 -21

a= -2.14 ?
idk im probly wrong lol
it only simplifies to '-24=21n+21a' if i'm right
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Last edited by tjbhdeath squad at Nov 16, 2008,
there are two variables. What are you solving for?
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Thats the thing, it doesnt say what im solving for. it says to Solve completely, and thats all
:S. if it was more specific and/or gave me one of the variables, this'd be no problem
yea, like whats the whole question
Quote by tie_my_rope
6n-3(7a+8)=27n

-3(7a +8) = 27n-6n
-21a - 24 = 21
-21a = 21 + 24
-21a= 45
---- ---
-21 -21

a= -2.14 ?
idk im probly wrong lol

you are wrong.. you can't just get rid of the n

the only way you can solve this is if you have another equation. If it just says solve, then solve the equation for one varible. so a=blahblah+blah(n)
the farthest i can get is -7a=7n+8
yea i thought i was wrong lol
Quote by RHCP987123
its called distributive property of multiplication, and substitution; you have to solve for one variable and then plug that back in to solve, then just solve.

You can't do this without another equation.
6n-3(7a+8)=27n =
6n -21a - 24 = 27n
21n = -21a -24
---- ----------
21 21

n = -a - 8/7

^ Plug that back into 6n -21a - 24 = 27n and then that will give you a, then do it again for a, then that will give you n

or something.
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6n - 21a + 24 = 27n
-21a = 27n - 6n - 24
21a = 24 - 21n
a = 24/21 - n

6n - (24/21 - n) + 24 = 27n
-24/21 + n + 24 = 21n
-24/21 + 24 = 20n
1.14 = n

a = 24/21 - n
a = 24/21 - 1.14
a = 0

so,
n = 1.14 and a = 0
Is this for finding linear X and Y intercepts?
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When I tried solving it, 'a' canceled out, so put (/)
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Uhh.. I remember that from 7th grade....

2years ago.

How..?
You have to leave variables in your solution. If you want to completely solve it, you need another equation.

I tried to completely solve it anyways but I realized that I failed when I checked it.
Quote by Twelf_Fret
6n - 21a + 24 = 27n
-21a = 27n - 6n - 24
21a = 24 - 21n
a = 24/21 - n

6n - 21(24/21 - n) + 24 = 27n
-24/21 + n + 24 = 21n
-24/21 + 24 = 20n
1.14 = n

a = 24/21 - n
a = 24/21 - 1.14
a = 0

so,
n = 1.14 and a = 0

Sorry.
Quote by Masonpwiley
You have to leave variables in your solution. If you want to completely solve it, you need another equation.

I tried to completely solve it anyways but I realized that I failed when I checked it.

You don't need to.
You just solve so n or a is by itself, then plug it back into the equation. Its called like... subsititive property or something.

Just set 'n' or 'a' so it looks like

a = 3434n + 456546 or whatever then plug it back into the equation to get a.

I don't know, something like that.

When I did it, I got a to cancel out, so I probably did it wrong.
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Quote by xX.SirenSong.Xx
i need help with an algebra question.

the directions only say Solve

6n-3(7a+8)=27n

21n=-3(7a+8)
21n=-3a-24
45n=-3a
a=-15n

substitute!

6n-3(7(-15n)+8)=27n
6n-3(-105n+8)=27n
6n-315n+24=27n
-309n+24=27n
-285n=-24

n=.08 ?
i might have done something incorrectly, for i did this without a calculator :/. Anyway, solve for either a or n and then substitute whatever you get for either variable.
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substitution property....
Quote by paintITblack39
21n=-3(7a+8)
21n=-3a-24
45n=-3a
a=-15n

umm... what?

I don't think that's how you're supposed to distribute.
You can't add the 24 onto the 21n.
Quote by Godsmack_IV
umm... what?

I don't think that's how you're supposed to distribute.
You can't add the 24 onto the 21n.

oops, i messed up.

in my defense, i did this on the internet and not paper .
Sent from my iPad.