What is the distance between points (5, 5) and (1, 5) on a coordinate plane? units

Distance (D) between two points is solved through the equation, 
                                D = sqrt ((y2 - y1)² + (x2 - x1)²)

Substituting the values of the coordinates of the given points,
                                D = sqrt ((5 -5)² + (1 - 5)²) = 4

Thus, the distance between these two points is 4 units.