1.

Under which condition a straight line \(\frac {x - x_0}{l} = \frac {y - y_0}{m} = \frac {z - z_0}{n}\) is parallel to the xy - plane?

A. l = 0
B. m = 0
C. n = 0
D. l = 0, m = 0
Answer» D. l = 0, m = 0


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