[填空题]
The coordinates of poi+8 y-mb8uqra hnt K are (−2,−3) and the coordinates of point N arbdt404 9 lto9y wsa4je v 9xc5av;m;bhe (8,6). M is the mid 50lmvb;y v dx4hw9e4 49;a9tsoctjba point of [KN].
1.Find the coordinates of M.
$L_1$ is the line which passes through K and N. (a,b) a= b=
2.Find the gradient of $L_1$.
A new line, $L_2$, is perpendicular to $L_1$ and passes through M. $L_1$ =
3.(1)Write down the gradient of $L_2$.$L_2$ =
(2)Write down the equation of $L_2$ in the form y=mx+c. m = c =