Find the slope of the group of the linear function f: f(5/2)=7/2, f(4)=6

If the function f(x,y) is linear, it is in the form:

f(x) = y
Where m is the slope, and b is the intercept.
The slope can be found from two given points P1(7/2,5/2), P2(6,4)
by
m = (y2-y1)/(x2-x1)
If you substitute the values of x1,y1,x2,y2, you should get a slope of 5/3.