SOLUTION: What is the value of g[f(3)] for the functions f(x) = 3x – 5 and g(x) = x + 1? (Type only the value of your final answer, no variables.) Change the given equation into slope-in

I won't do it for you.  Instead I'll do one exactly like this one, 
and just change the numbers:

            First find f(4) by substituting x=4 in f(x) = 4x - 7

                       f(x) = 4x - 7
                       f(4) = 4(4) - 7
                       f(4) = 16 - 7
                       f(4) = 9

Now g[f(4)] is equal to g(9).  So we find g(9) by substituting x=9 
in g(x) = x + 3.

                       g(x) = x + 3
                       g(9) = 9 + 3
                       g(9) = 12.

So g[f(4)] = g(9) = 12.

Do yours the exact same way.

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I'll do this one instead:

                                4x + 5y = 20
                                     5y = -4x + 20
     Divide every term by 5
                                     = x + 
                                      y = x + 4
Do yours the exact same way.
  
Edwin