Exercise 67

Which of the following four planes are parallel? Are any of them identical? \(P_1: 3x + 6y - 3z = 6\) \(P_2: 4x - 12y + 8z = 5\) \(P_3: 9y = 1 + 3x + 6z\) \(P_4: z = x + 2y - 2\)