The slope can be a fraction.
yes, slope can be fraction. It's like -1, -1/3 , 4/5 , 4 and so on.
Why not? m=4/3 is a perfectly good slope
The equation for slope = rise / run
Only if it happens to BE a whole number. As you probably know, you can't "convert" a fraction to a whole number, without losing precision. But the slope may well happen to be a whole number, such as 1, 2, 3, -1, etc. (or close enough to a whole number).
Steepest line possible dealing with slope is up to, but not including infinity.
It is simply the arctan transformation of the fraction.
Any fraction is possible.
Y= -2/3x -12