i cant do these questions which are probz straight 4ward but i cant do them

for some reason my diagram isn't uploading
in the diagram A is the point (7,0), B is (-3,-2 and C (-1,8)
The median CE and the altitude BD intersect at J.
a)find the equations of CE and BD
b)find the co-ordinates of J.
so far i have
mAB= [0-(-2)] / [7-(-3)] = (0 + 2) / (7 + 3) = 2/10 = 1/5 therefore mAB = 5/1 = 5 since m1 * m2 = -1
using c = (-1,8) in y - y1 = m (x-x1)
gives y-8=-1 (x-(-1))
y-8=-1(x+1)
y-8=-x - 1
y=-x -1 + 8
y=-x + 7
therfore y + x = 7
can anyone tell me what to do next and if that is right or wrong? thank you in advance