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Question
Find the vector equation of the lines which passes through the point with position vector `4hati - hatj +2hatk` and is in the direction of `-2hati + hatj + hatk`
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Solution
Let `bara = 4hati - hatj + 2hatk`
`barb = -hat2i + hatj + hatk`
Equation of the line passing through point `A(bara)` and having direction `barb` is
`barr = bara + lambdabarb`
`barr = (4hati - hatj + 2hatk) + lambda(-2hati + hatj + hatk)`
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