32.06=56.68 34.26=56.68 35.84=56.68 39.2=56.68 44.92=56.68 52.24=56.68
I think you MEAN f(32.06)=56.68 f(34.26)=56.68 f(35.84)=56.68 f(39.2)=56.68 f(44.92)=56.68 f(52.24)=56.68 and are asking "what is f". In fact there are infinitely many functions that satisfy this- there are infinitely many functions that will give ANY finite number of data points. With this function, since every given value of x gives the same y value, 56.68, the simplest function is just the constant function f(x)= 56.68 for all x.
A straight line, yes, but, more to the point, an horizontal line, at a height of 56.68 units above the x-axis.
The equation is f(x) = 56.68. This is assuming that the line is always horizontal, and completely continuous with no vertical asymptotes or undefined points.