What is the distance between the two points located at (-3,8) and (-3, -7)

The first point is (x1,y1). The second point is (x2,y2)

Since the first point is (-1, -3), we can say (x1, y1) = (-1, -3)
So , 

Since the second point is (-4, -8), we can also say (x2, y2) = (-4, -8)
So , 

Put this all together to get: , , , and