Question 288657
If f(4) = 0 and f(6) = 6, this means that the equation is a straight line that goes through the points (4,0) and (6,6). 


*[invoke calculating_slope 4,0,6,6]


So the equation of the line that goes through the points (4,0) and (6,6) is {{{y=3x-12}}}. Just replace the 'y' with 'f(x)' to get {{{f(x)=3x-12}}}. So the answer is D)