Question: Is the line through ( - 4 , 5 , 0 ) and ( 1 , 1 , 1 ) perpendicular to the line through

Is the line through (-4,5,0)and (1,1,1)perpendicular to the line through (2,3,4)and (5,-1,-6)?
For the direction vectors of the lines, v1*v2=-Therefore, the lines perpendicular.
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