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October 21, 2014

October 21, 2014

Posted by **Sue** on Monday, November 26, 2012 at 11:46am.

I have

a=3c f=a-16 a-1=2(c-1 + f-1)

and I don't understand what comes next and why

- algebra -
**Steve**, Monday, November 26, 2012 at 11:56ama=3c

f=a-16

a-1=2(c-1 + f-1)

so far, so good. Now start substituting. First, get rid of a:

f = 3c-16

3c-1 = 2(f+c-2)

Now get rid of the f:

3c-1 = 2((3c-16)+c-2)

3c-1 = 2(4c-18)

3c-1 = 8c - 36

5c = 35

c = 7

so, f = 3c-16 = 5

and a = 3c = 21

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