Giải thích các bước giải:
a. VTCP: \(\underset{a}{\rightarrow}(1;5)\)
\(\left\{\begin{matrix} x=1+t
& & \\ y=-3+5t
& &
\end{matrix}\right.\)
VTPT: \(\underset{n}{\rightarrow}(-5;1)\)
\(-5(x-1)+1(y+3)=0 \leftrightarrow -5x+y+8=0\)
b. VTCP: \(\underset{a}{\rightarrow}(-7;-3)\)
\(\left\{\begin{matrix} x=5-7t
& & \\ y=-1-3t
& &
\end{matrix}\right.\)
VTPT: \(\underset{n}{\rightarrow}(-3;7)\)
\(-3(x+5)+7(y-1)=0 \leftrightarrow -3x+7y-22=0\)