The straight line `(x-3)/3=(y-2)/1=(z-1)/0`isParallel to x-axisParallel to the y-axisParallel to the z-axisPerpendicular to the z-axis
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The line is along the vector `3hati+hatj` which is perpendicular to the z-axis as `(3hati+hatj)*hatk=0`.