Solution:The nomal vector of plane L?x + y - z = 3 is (1, 1, -1)The nomal vector of plane L?4x + y - z = 3 is (4, 1, -1)Therefore, the directional vector N of the intersection of L?and L?= (1, 1, -1)×(4, -1, 5) = (4, -9, -5)We can find a point on the line of intersection of L?and L&#...
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