Find the distance between the points (-5,-4) and (3,1)
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.