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not happy with the last answer? i still think it is C, since you are "substituting" 15 for C
I did not know it was called Substitution Property of Equality.
C is the only one that makes sense..
But If you understand what variables and linear equations are, sure you won't have problems, chooseing the roght answer.
That is C, like TT said.
frankly i didn't know that either, but it seems to be the only one that makes sense
okay i was just not sure if it was and satellite73 i was just getting another persons opinion
I think that everyone here agrees =).
@satellite73 did that get you mad??
i hope not