input: Write a function to calculate the distance between two points given their coordinates (x1, y1) and (x2, y2) in a 2D plane. Use the Euclidean distance formula to compute the distance.
  import math
  
  def distance_between_points(x1, y1, x2, y2):
      return math.sqrt((x2 - x1)**2 + (y2 - y1)**2)
  
  # Test cases
  assert distance_between_points(2, 7, 4, 9) == math.sqrt(8)
  assert distance_between_points(0, 0, 3, 4) == 5.0
  assert distance_between_points(-1, -1, 2, 3) == 5.0
  assert distance_between_points(1, 1, 1, 1) == 0.0
  assert distance_between_points(-5, -5, -5, -5) == 0.0
output: 
  def distance_between_points(x1, y1, x2, y2):
      return math.sqrt((x2 - x1)**2 + (y2 - y1)**2)
  