[填空题]
The coordinates of point A are (6,,yvo4 wj-+l izh+t h:vgaez+.0 y1pq b−3) and the ckiy* ds07 ulygr7*-iv oordinates of point B are (−2,−1).-*i0s u* gdlyi7rk7yv $L_1$ 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 =