I have no clue



Okay. Your first step combining 1 + 5 is good.

6 = -2n + 6

We want n by itself. So, next, get -2n by itself first by subtracting 6 from both sides.

Then, solve for n by dividing both sides by the coefficient on n (that is, -2).

Show me your work, and I'll show you a short-cut in reasoning. 8-)

 
Okay so this is what i got:
6=1-2n+5
6=-2n+6
-6 -6
then i got
0/-2=-2n/2
& then i'm lost again?
 
4smiles said:
0/(-2) = -2n/(-2) Your last result is good. (I edited your typing.)
Click to expand...

Do you know how to reduce a fraction ?

If the same factor appears both on top and bottom, we can cancel it in both places.

On the righthand side of the equation above, the factor -2 appears on top and on bottom. Cancel it.

On the lefthand side, zero divided by anything (other than itself) is zero.

What do you get ?
 
oh, okay, thanks
& i remember that, so you cross it out so the final answer is 0
right/
:D
 


Yes, the solution is n = 0.

Now, let's look back near the beginning:

6 = -2n + 6

If you think about it, you should realize that this equation is only true if -2n is zero because zero is the only Real number that we can add to 6 and end up with 6.

6 = 0 + 6

Since -2n must be zero, n must be zero because zero is the only Real number that gives a product of zero when multiplied by -2.

 


You can forget about the last part. It's just another way of solving the same exercise.

The way that you solved it is the way for you to go. In time, you'll naturally come to understand the other way.

 
oh, well thank you, soo much :D
i typed 6+-2 mu[*]0
in my calcutator(sp?)
& i got 6
so i'm thinking that's what you mean, so the equations is untrue? right?
 
4smiles said:
i typed 6+-2 mu[*]0
in my calcutator(sp?)
& i got 6

Yes, 6 is the correct result because n = 0 is the solution.

We want the number n that makes (-2n + 6) equal to (6).

(6) = (-2n + 6)

Your calculator shows that n = 0 is the correct solution.

In other words, the equation is true when n = 0.
Click to expand...

6 = -2n + 6

6 = -2(0) + 6

6 = 0 + 6

6 = 6

A true statement.

 
\(\displaystyle 6 \ = \ 1-2n+5, \ 6 \ = \ -2n+6, \ 6-6 \ = \ -2n+6-6, \ 0 \ = \ -2n, \ n \ = \ \frac{0}{-2} \ = \ 0\)

\(\displaystyle Check: \ 6 \ = \ 1-2(0)+5, \ 6 \ = \ 1+5, \ 6 \ = \ 6, \ QED\)
 
okay, thank you
Am i allowed to ask another one, because
i was doing another one:
a+5=-5a+5
-4a+5=5
Do i subtract 4 from or 5 from 4?
like: -4a+5=5 (the 4 goes under the 2nd 5 but it won't stay :(
-4 -4
is that right ?
OR is it?
this:
-4a+5=5 (same thing with this one the 5 goes under the last five)
-5 -5
Please help?


Sorry, I'm horrible at math :(
 
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