Posted by Olivea on Sunday, October 26, 2008 at 12:31pm.
I'm not really sure on how to prove statements are right with properties as reasons. How would you solve this?
If x + c = 0, then x = c
Statements:
1. x+c=0
2. (x+c)+(c) = 0 + (c)
3. x + [c+(c)] = 0 + (c)
4. x + 0 = 0 + (c)
5. x = (c)
Would 5 be the substitution property?

Math Help  Olivea, Sunday, October 26, 2008 at 12:37pm
Does that mean 1 would be be reasoned by the substitution property?

Math Help  Anonymous, Sunday, October 26, 2008 at 12:43pm
yes i think that's correct coz when we do this sum ,,,we do it in this way
x+c=0
x+c=0
c c (subtracting x both side)

that is x=c

Math Help  Olivea, Sunday, October 26, 2008 at 12:51pm
Oh, thank you. For number 2, I originally had the definition of addition, but I was marked wrong. I'm not very sure, but wouldn't it be considered the definition of addition if you were adding (c) to both sides? And also, in this case x+c would equal 0 so that would be the reason you are substituting 0 for x+c in number 2 as well. I don't really understand properties..

Math Help  Anonymous, Sunday, October 26, 2008 at 1:33pm
yes that's it/......u got it
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