n each system, at least one pair of planes are parallel. Describe each system in words. ( no math needed)  a. 2x − y+ 4z = 5 6x − 3y+ 12z = 15 4x − 2y + 8z = 10 b. 3x + 2y− z = 8 12x + 8y− 4z = 20 18x + 12y − 6z= −3

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