Line through a point parallel to an axis or perpendicular to a coordinate plane

1. A.
   $\bar{r} = (4\hat{i} - 2\hat{j} + 3\hat{k}) + \lambda(\hat{i} + \hat{k})$
2. B.
   $\bar{r} = (4\hat{i} - 2\hat{j} + 3\hat{k}) + \lambda(\hat{i})$
3. C.
   $\bar{r} = (4\hat{i} - 2\hat{j} + 3\hat{k}) + \lambda(\hat{j})$
4. D.
   $\bar{r} = (4\hat{i} - 2\hat{j} + 3\hat{k}) + \lambda(\hat{i} - \hat{k})$

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1. A.
   $y = 1, z = 1$
2. B.
   $x = 0$
3. C.
   $x + y + z = 2$
4. D.
   $y = z$

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