SOLUTION: C = 3n + 210 C = 10n How is the answer 10n?

Question 1047208: C = 3n + 210
C = 10n
How is the answer 10n?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I'm guessing that isn't
actually the answer.
I think that you are being given 2
equations:
(1)
(2)
Both of these can be true, but only for
1 value of
------------------------------------
That is because they are straight lines which
can only intersect in 1 point.
Now I will find that point ( the solution )
-----------------
Substitute (2) into (1)
(1)
(1)
(1) ( what they are looking for )
and also:
(2)
(2)
----------------
So, the point of intersection is ( 30, 300 )
Here is the plot of both lines:

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