Which of the following systems of equations has no solution?

Which of the following systems of equations has no solution?
1. { y = 8x - 17 \ y = -8x + 17 }
2. { y = (2/3)x - 3 \ y = (2/3)x + 4 }
3. { y = 2x - 5 \ 2y = 4x - 10 }
4. { y = 3x + 4 \ y = -(1/3)x + 4 }