begin{arraylx=2-3ty=5+tendarray.

常见问题解答

• 写出矩形方程 $\{\begin{array}{l}x=2-3t\\ y=5+t\end{array}$

  

  $$y=\frac{17-x}{3}$$

• 求参数导数 $\{\begin{array}{l}x=2-3t\\ y=5+t\end{array}$

  

  $$\frac{dy}{dx}=-\frac{1}{3}$$