#1

i need help with an algebra question.

the directions only say Solve

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

the directions only say Solve

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

#2

Quit sleeping in class or skipping school like the dumbass you are and maybe you'll be able to figure it out.

#3

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.

#4

6n-21a+-24=27n

now solve for that i dont feel like helping anymore

now solve for that i dont feel like helping anymore

#5

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

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

-21a - 24 = 21

-21a = 21 + 24

-21a= 45

---- ---

-21 -21

a= -2.14 ?

idk im probly wrong lol

#6

it only simplifies to '-24=21n+21a' if i'm right

*Last edited by tjbhdeath squad at Nov 16, 2008,*

#7

there are two variables. What are you solving for?

#8

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

:S. if it was more specific and/or gave me one of the variables, this'd be no problem

#9

yea, like whats the whole question

#10

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)

#11

the farthest i can get is -7a=7n+8

#12

yea i thought i was wrong lol

#13

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.

#14

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.

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.

#15

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

-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

#16

Is this for finding linear X and Y intercepts?

#17

When I tried solving it, 'a' canceled out, so put (/)

#18

Uhh.. I remember that from 7th grade....

2years ago.

How..?

2years ago.

How..?

#19

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.

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

#20

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.

#21

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.

#22

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.

#23

substitution property....

#24

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.

#25

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 .