## Recommended Posts

I need help. I forgot (somehow :oops: ) how to do this. Can someone help me?

This is the substitution method for linear equation. The answer must be an ordered pair.

13. x-y=5

x+2y=7

Could you give me step by step tips?

Thanks xD

:oops:

Sorry for all the trouble.

Sig by CommanderSozo. Kiss him. Now.

*The above post is not to be taken seriously. The above post contains sarcasm, and if you were offended by the above post, it is purely coincidental

Sign here __________*

If you use PdN, don't click this.

##### Share on other sites

If you want to solve by substitution, here is how you do it. You solve one of the equations for a variable (x or y). It doesn't matter which one. So, x-y=5 can become x=y+5. Then, you substitute the equation on the right side of that (y+5) for x in the other equation (since x now = y+5).

So x+2y=7 becomes (y+5) + 2y = 7. Find y in that equation (that's now the y of your ordered pair), it back into the first equation (x-y=5), and solve for x. You now have your ordered pair.

Lemme know if you need more clarification - I might not get back to you right away, but I'm sure some other folks on the forum are good at math too.

ambigram signature by Kemaru

[i write plugins and stuff]

If you like a post, upvote it!

##### Share on other sites

Oh god - I don't understand this!

**faints**

Despite the fact I'm good at maths, I'm not good at algebra. But like pyrochild said, there's bound to be more who actually understand this and will be able to help you.

##### Share on other sites

damn ive forgot too

it was ages ago i did this

but im year 9 and im working on level 8 stuff which only the top set works on (which is me )

psn id: R3V-fiR3

##### Share on other sites

This is not a "Homework Help" forum. Sorry.

Click to play: