[填空题]
The coordinates of p : c;rn3-yb2fvakzj k2oc* nh31eg:ikbint A are (6,−3) and the coordinates of point B are (−2,−1)1: gcn bikh3*e. $L_1$ is the line which passes through A and B.
1.Find the equation of $L_1$.
Point M is the midpoint of [AB]. The line $L_2$ is perpendicular to $L_1$and passes through M. y = ax+b a = b =
2.Find the equation of$L_2$. y = ax+b a = b =