How do you know if an equation is open or not?

Question

anonymous · Answer

what do u mean?

anonymous · Answer

like 9p+8=10p+7. its asking me if its true, false, or open. so  how do you know when an equation is open

anonymous · Answer

Yes it is open

anonymous · Answer

I think that if its in brackets than the equation is closed otherwise open

anonymous · Answer

okay thanks (: so why is it open? @KissMyAxe

anonymous · Answer

Where do they ask these type of questions??? Is it in SAT maths?

anonymous · Answer

haha no its just a question that i have cause im confused @KissMyAxe

aum · Answer

9p+8=10p+7
subtract 9p:
8 = p + 7
subtract 7:
1 = p

So there is only one value of p that satisfies the given equation.  Therefore, it is a closed equation.  An open equation has infinite number of solutions.

anonymous · Answer

Thanks @aum

aum · Answer

You are welcome.

anonymous · Answer

thanks so much @aum

aum · Answer

Glad to be able to help.

anonymous · Answer

@diane96 forget whatever i said!

anonymous · Answer

haha well thanks anyways @KissMyAxe

anonymous · Answer

Pleasure :)

aum · Answer

My answer above is based on the definition of open and closed equations I found here: http://openstudy.com/study#/updates/52371f3de4b0af32a079babf A general search on the web does not yield any useful info. I myself have not heard of this definition before. What is the definition given in your book / notes / teacher?