4. Find a parametric equation for the line of intersection of the planes 2x+3y+z = 11 and 4x + 9y − z = 31 (a) x = 12t, y = 3 − t, z = = t (c) x = 1 − 2t, y = 3+t, z = t (b) x = 1+2t, y = 3+t, z = t (d) x = 3+t, y = 1 - 2t and z = t (e) None of these a b cd e

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