3-d

Question: Under what condition does a straight line $\frac{x-{{x}_{0}}}{l}=$$\frac{y-{{y}_{0}}}{m}=\frac{z-{{z}_{0}}}{n}$ is parallel to the xy-plane

1) $l=0$

2) $m=0$

3) $n=0$

4) $l=0,m=0$

Solution:

Explanation: No Explanation

Line and plane

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