input: def solve_linear_equation_system(a, b, c):
      """Given the coefficients a, b, and c of a linear equation system of the form: ax + by = c,
      return the values of x and y that satisfy the equation.
      >>> solve_linear_equation_system(2, 1, 4)
      (2.0, 0.0)
      """
output:     determinant = a * 1 - b * 0
      if determinant == 0:
          raise ValueError("The system has no unique solution.")
      x = (c * 1 - b * 0) / determinant
      y = (a * 0 - c * 0) / determinant
      return (x, y)