g(x)=1/3x-9 find g(6)+g(a)

Question

How find answer above written out, class is on line and hard to go back

 

 

Answer 1

The method to solve this is just to substitute whatever is in the parentheses for x in the original function.  

 

ex.  f(x) = 3x - 4  and you need f(5)

      f(5) = 3(5)-4 = 15 - 4 = 11

Answer 2

As written, the equation is:

 

g(x) = (1/3)x - 9

 

g(6) = (1/3)(6) - 9 = -7

g(a) = (1/3)a - 9 = a/3 - 9

 

g(6) + g(a) = -7 + a/3 - 9 = ____?