Slope of a function at a particular point is the derivative of the function at that point.

`f(x)=3x^2-4x`

`f'(x)=6x-4`

Now the derivative at the point (1,-1) can be obtained by plugging in the value of x in f'(x).

`f'(1)=6*1-4`

`f'(1)=6-4`

`f'(1)=2`

Thus the slope of the function at the given point is 2.