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Mycurses · Apr 12, 2011, 05:58 PM

This equation is driving me insane. Last night I actually spazed and ripped all my equations to shreds. So please help:

9n+3-7n-4=2+5n

Unknown008 · Apr 13, 2011, 10:58 AM

Is that it?

$9n + 3 - 7n - 4 = 2 + 5n$

Rearrange like this, without any real change:

$9n - 7n + 3 - 4 = 5n + 2$

You see that the signs before the numbers/terms are still the same? Okay, now work out parts of it:

9n - 7n = ?
3 - 4 = ?

Take the signs and put them in your equation. What do you get now?

Once you do that, we'll do the next part.

Mycurses · Apr 13, 2011, 05:55 PM

Please I don't want to work through it. I'm better at working backwards then forwards.

If you tell me the answer I could probably tell you how you got it?

Unknown008 · Apr 14, 2011, 07:57 AM

I'm afraid I won't do that, because you will not always get problems that you can work it backwards then forwards just because the way backwards is more complicated.

This is something very basic, come one, give it a try and post what you get after the step I posted earlier :)

Mycurses · Apr 14, 2011, 01:13 PM

Oh see last night I was tired I didn't understand. Also we got a math lesson tonight that made me understand what you were asking.

9n-7n=2n
3-4=(-1)

Unknown008 · Apr 15, 2011, 07:55 AM

Yes, so now you have:

2n - 1 = 5n + 2

That's already easier! :)

Now, what can you do to remove one term in 'n' from one side.

Do:

2n - 1 - ?n = 5n + 2 - ?n

This should result in a term in n on one side only (the other should give 0n = 0)

If you can understand that... an example:

x + 2 = 2x - 3

Remove x from both sides:

x + 2 - x = 2x - 3 - x

x - x = 0, so;

2 = x - 3