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Is the line through (−3, 3, 0) and (1, 1, 1) perpendicular to the line through (2, 3, 4) and (6, −1, −7)? For the direction vectors of the lines, v1⋅v2 = Therefore, the lines perpendicular.

Is the line through (−3, 3, 0) and (1, 1, 1) perpendicular to the line through (2, 3, 4) and (6, −1, −7)? For the direction vectors of the lines, v1⋅v2 = Therefore, the lines perpendicular.

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Is the line through ( − 3 , 3 , 0 ) and ( 1 , 1 , 1 ) perpendicular to the line through ( 2 , 3 , 4 ) and ( 6 , − 1 , − 7 ) ? For the direction vectors of the lines, v 1 ⋅ v 2 = ◻ Therefore, the lines ◻ perpendicular.

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