input: Write a python function to solve a system of linear equations and return the solution as a tuple.
  assert solve_linear_equations(1, 2, 3, 4, 5, 6) == (-4.0, 4.5)
  assert solve_linear_equations(2, 3, 4, 5, 6, 7) == (-1.0, 2.0)
  assert solve_linear_equations(1, -1, 1, 1, 3, 1) == (2.0, 1.0)
output: def solve_linear_equations(a1, b1, c1, a2, b2, c2):
      determinant = a1 * b2 - a2 * b1
      if determinant == 0:
          raise ValueError("The system of equations has no unique solution.")
      
      x = (c1 * b2 - c2 * b1) / determinant
      y = (a1 * c2 - a2 * c1) / determinant
      
      return (x, y)