$A. d:\left\{\begin{array}{c}x=2+t\\ y=1-4t\\ z=-2t\end{array}\right.$

$\mathbf{B}. d:\left\{\begin{array}{c}x=2-t\\ y=1+t\\ z=t\end{array}\right.$

$\mathbf{C}\mathbf{.} d:\left\{\begin{array}{c}x=1+t\\ y=-1-4t\\ z=2t\end{array}\right.$

$\mathbf{D}. d:\left\{\begin{array}{c}x=2+2t\\ y=1+t\\ z=-t\end{array}\right.$

A. $\mathrm{d}: \frac{\mathrm{x}-1}{-2}=\frac{\mathrm{y}}{1}=\frac{\mathrm{z}}{1}$

B.  $\mathrm{d}: \frac{\mathrm{x}-1}{3}=\frac{\mathrm{y}}{2}=\frac{\mathrm{z}}{4}$

C. $\mathrm{d}: \frac{\mathrm{x}+1}{2}=\frac{\mathrm{y}}{1}=\frac{\mathrm{z}}{1}$

D. $\mathrm{d}: \frac{\mathrm{x}-1}{1}=\frac{\mathrm{y}}{1}=\frac{\mathrm{z}}{1}$

A. $\mathrm{d}: \frac{\mathrm{x}-2}{4}=\frac{\mathrm{y}+1}{5}=\frac{\mathrm{z}-1}{7}$

B. d: x = 2 + 4t, y = 1 + 5t, z = 1 + 7t

C. d: x = 2 +4t, y = -1 - 5t, z = 1 + 7t

D. d: x = -2 + 4t, y = 1 + 5t, z = -1 + 7t

A. y = 2x + 1; y = −2x – 1

B. y = 2x + 1; y = −2x + 1

C. y = 2x + 1; y = 2x – 1

D. y = −2x + 2; y = −2x + 1