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1 Answer

y = 3x - 4
 
Take the first two points:
 
(5,11) and (6,14)    Note that you could use any of them, but the numbers are smaller for these two.
 
Slope m = (14-11)/(6-5) = 3/1 = 3
 
Take either point and use the point-slope formula:
y - 11 = 3(x-5)
 
Distribute:
y - 11 = 3x - 15
 
Add 11 to both sides:
y = 3x - 15 + 11
 
Combine like terms:
Answer: y = 3x - 4
 
 
f(17) = 3(17) - 4 = 51-4 = 47
 
f-1(56) =>  y=56=3x-4
56=3x-4
56+4 = 3x
60 = 3x
x = 20
 
Hope this helps.
Jason