input: 
  def linear_eq(a: int, b: int, c: int, x: int, y: int) -> int:
      """
      Calculate the objective function of a linear equation given the coefficients and a specific point (x, y).
      >>> linear_eq(3, 5, 7, 1, 1)
      1
      >>> linear_eq(3, 5, 7, 2, 2)
      9
      """
      return a*x + b*y - c
  
output:     return a*x + b*y - c