How to determine a vector parallel to another vector.

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SUMMARY

The discussion centers on determining a vector parallel to another vector, specifically the vector $\vec{r}=<5,2-t,10+4t>$, with the parallel vector identified as $\vec{a}=<0,-1,4>$. The calculation demonstrates that $\vec{r}$ can be expressed as a linear combination of $\vec{a}$, scaled by a factor of t and translated by the point (5, 2, 10). This confirms that $\vec{a}$ is indeed parallel to $\vec{r}$, as it maintains the same direction while being offset in space.

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Drain Brain
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I wonder how my book did the calculation for this example

$\vec{r}=<5,2-t,10+4t>$ the vector parallel to it is $\vec{a}=<0,-1,4>$

can you show the workings of this example! TIA!
 
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Drain Brain said:
I wonder how my book did the calculation for this example

$\vec{r}=<5,2-t,10+4t>$ the vector parallel to it is $\vec{a}=<0,-1,4>$

can you show the workings of this example! TIA!

$\displaystyle \begin{align*} \mathbf{r} &= \left( 5, 2 - t , 10 + 4t \right) \\ &= \left( 0 , -1, 4 \right) \, t + \left( 5 , 2, 10 \right) \end{align*}$

It is clearly parallel to $\displaystyle \begin{align*} \left( 0, -1, 4 \right) \end{align*}$, just scaled up by some factor t, and moved 5 units in the x direction, 2 units in the y direction, and 10 units in the z direction.
 

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