To determine the equations of a line that passes through M r (2.1,-1) and is orthogonal to the plan, ret, and r: $\displaystyle \frac{x-2}{3}=\frac{y+1}{2}=z-1$ and t: $\displaystyle \frac{x}{6}=\frac{y}{4}=\frac{z}{2}$

Answer:

$\displaystyle \frac{x-2}{-3}=y-1=\frac{z+1}{7}$