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Let f =[(2,6),(3,8),(4.5) and g(x)= 3x+5, Find the following.

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2 Answers

If the function f includes the points (2,6), (3,8), and (4,5) (I'm assuming)
 
A)  f(2)=6  look at the placement of x and y and remember that f(x) IS y for all intents and purposes right now. 
 
C)  if f(x)=8, find a coordinate with the y value 8, and look at the 8 value.  We get 3
 
E)  Since f(4)=5, and g(4)=3(4)+5=17
 
5-17= -12
I think some notation has been incorrectly typed.
b. g(2) means in g(x), x = 2 and should replace x in the function so g(2) = 3(2) + 5 which is g(2) = 11
d.  If g(x) = 26, then 26 = 3x + 5, 26 - 5 = 3x, 21 = 3 x, 21/3 = 3/3 x, 7 = x