[填空题]
The coordinates of p*n fz kfffw(o ay5.l-,oint A are (6,−3) and the coordi+ut+kyk. d.q5 k) qe0 nfshoz-nates of point B are (−2,−1).h0+nkqd5 y ef)o..uq s-kkzt+ $L_1$ 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 =
