How do you find the distance between (-4,1) and (3,-1)?
This is basically Pythagoras' therom just on a graph. As the shortest distance between these points will be straight and you can make a right-angled triangle from these co-ordinates
So you fin the difference in the x co-ordinates (3--4=7) and the difference in the y co-ordinates (1--1=2)
These are a and b in the equation
distance between (-4,1) and (3,-1) =