[填空题]
The coordinates of point K are (−2,−f amcun supn)w)sz+lt;m95c .8-9b tw3) and the coordinates of -ho;azo i ,l6l igw8v0point N are (8,6). M is the midpointl 6aiooi; lhv -0z8gw, 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 =
