Which gives the line of best fit?
f(x)=45x
f(x)=x
f(x)=2x
f(x)=45x+45

Answer:
f(x) = x
Step-by-step explanation:
example of points on line: (40,40), (45,45), (50,50)
x-values are the same as y-values which means the line is y=x