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Alright, which formula do you think will help you solve this?

I want to say midpoint but that's not right

It is right. :)

Okay, so how do you break it into two parts?

Yes

Following?

Okay, but how did you get 8?

\[\frac{ x1+x2 }{ 2 }=Xm\]

Oh right. Sorry I got confused

Refer to that if it helps you understand why I picked which points. :)

Alright so we can continue?

Yes please

Don't you first multiply everything by 2 to get rid of the fraction?

Correct.

so is it x1+10=16? is that correct so far?

Oh. okay, yes got it

so x1=11

So the answer is 11, -2?

Perfect!

Don't forget parenthesis

Thank you :)

You are welcome. :D