A.  $\frac{x}{1}=\frac{y}{-4}=\frac{z}{3}$

B.  $\frac{x-1}{1}=\frac{y-4}{4}=\frac{z-3}{3}$

C.  $x+4y+3z=0$

D.  $x-4y+3z=0$

A.  $\left\{\begin{array}{l}x=4t\\ y=-2t\\ z=t\end{array}\right.$

B. $\left\{\begin{array}{l}x=1+4t\\ y=-2t\\ z=t\end{array}\right.$

C. $\left\{\begin{array}{l}x=1+4t\\ y=2t\\ z=t\end{array}\right.$

D. $\left\{\begin{array}{l}x=4t\\ y=2t\\ z=t\end{array}\right.$

A.  $\frac{\sqrt{5}}{5}$

B. $\frac{45}{\sqrt{14}}$

C. $\sqrt{5}$

D. 3

A.  $M\left(2;-1;3\right), \stackrel{\to }{{\alpha }_d}=\left(-2;1;3\right)$

B. $M\left(2;-1;-3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;3\right)$

C. $M\left(-2;1;3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;3\right)$

D. $M\left(2;-1;3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;-3\right)$

A.  $M\left(2;-1;3\right), \stackrel{\to }{{\alpha }_d}=\left(-2;1;3\right)$

B.  $M\left(2;-1;-3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;3\right)$

C.  $M\left(-2;1;3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;3\right)$

D.  $M\left(2;-1;3\right), \stackrel{\to }{{\alpha }_d}=\left(2;-1;-3\right)$

A.  $M\left(2;-1;3\right), \stackrel{\to }{u}\left(-2;1;3\right)$

B. $M\left(2;-1;-3\right), \stackrel{\to }{u}\left(2;-1;3\right)$

C. $M\left(-2;1;3\right), \stackrel{\to }{u}\left(2;-1;3\right)$

D. $M\left(2;-1;3\right), \stackrel{\to }{u}\left(2;-1;-3\right)$

A. M(2;1;2)

B. M(0;1;-2) 

C. M(1;-1;-4)

D. M(2;-1;-2)