SOLUTION: if 3a-c=5b and 3a+3b-c=40, what is teh value of b?

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Question 470152: if 3a-c=5b and 3a+3b-c=40, what is teh value of b?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
system%283a-c=5b+%2C3a%2B3b-c=40%29
Subtract the first equation from the second one
3b=10-5b
3b%2B5b=40
8b=40
b=40%2F8
b=5