Respuesta :

Use the distance formula.  Do you know it?

D=Distance between points (a,b) and (c,d)=
    
     Sqrt(  [c-a]^2 + [d-b]^2 )

You could, for example, let (-5,4) be represented by (a, b) and (3,1) by (c,d), or vice versa.

The distance between the points is square root 89