SOLUTION: Sue is 7 years older than her cousin. Their product of their ages are 78. How old are they?

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Question 948251: Sue is 7 years older than her cousin. Their product of their ages are 78. How old are they?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S=7%2BC
S%2AC=78
Substituting,
%287%2BC%29C=78
C%5E2%2B7C-78=0
%28C-6%29%28C%2B13%29=0
Only the positive solution makes sense here.
C-6=0
C=6
So then,
S=7%2B6
S=13