calculate the vector placement of two seperate 2d vectors

def vector_placement(a, b):
  return a[0] + b[0], a[1] + b[1]

def vector_placement_plus(a, b):
  return a[0] + b[0], a[1] + b[1]

def vector_placement_minus(a, b):
  return a[0] - b[0], a[1] - b[1]

def vector_