Omfg. Homework help, PL0X.

[KCBlack]

Im not really the one to ask, but this is pretty complicated to me.


You guys know about the 'system of equations' and the 3 ways to solving them, right?...

1.graphing
2.substitution
3.elimination


Well I need some help with substitution..


When its something like this...

y=2x

and

y=3x-2

or

y=x

y=2x-4

What exactly do you do?


Yeah, I took notes on it in school, but its still pretty fuzzy in my head.
Help is much apreciated. =/

What grade you in? Anyway, I just got a 98 in advanced pre-al, so maybe I can help. :P
We just did this shit last week. We'll use this.
y=x

y=2x-4

So take y=x for example, or x=y. Now, if x=y, let's substitute in for the x variable in the second equation. So y=2(y)-4, y=2y - 4, -y = -4, then y=4. Now, to find x, let's substitute again. Go back to y=x. Substitue y for 4, leaving you with 4=x. So your solution is (4,4). Then check:
4=4 (correct)

and

4=2(4)-4
4=8-4
4=4 (correct).

There ya go.

[laughingman112]

What grade you in? Anyway, I just got a 98 in advanced pre-al, so maybe I can help. :P
We just did this shit last week. We'll use this.
y=x

y=2x-4

So take y=x for example, or x=y. Now, if x=y, let's substitute in for the x variable in the second equation. So y=2(y)-4, y=2y - 4, -y = -4, then y=4. Now, to find x, let's substitute again. Go back to y=x. Substitue y for 4, leaving you with 4=x. So your solution is (4,4). Then check:
4=4 (correct)

and

4=2(4)-4
4=8-4
4=4 (correct).

There ya go.

GOOD JOB man, give your self a high five for just telling him the answer and not letting him figure it out on his own. I lost all respect for your jakuza, I thought you were smarter than this. That equation was just child's play.

[Jakuza]

Well, im not exactly a fast learner, let alone an average learner.

[laughingman112]

Well, im not exactly a fast learner, let alone an average learner.

O well, you will learn. I was like that when I was young.