Find the ratio of output values that correspond to increases of 1 in the input value in order to determine the 1-unit growth factor. f ( x ) = 22.05 ( 4.91 )

Question

please help i do not understand 

Answer 1

(x,y) = (4.91, 22.05)

f(x) = x+17.14

y = x+ 17.14

as x increases by 1, y increases by 1

x= input, y=output

graphically it's a straight upward sloping line, with slope = 1

a 45 degree angle with the x axis

but the ratio of output to input approaches 1 as a limit as input and output increase endlessly