tolong dijawab materi segmen garis

Vektor
. C = m(A) = n(B)
m(2,1) + n(4,5) = (16,17)
2m + 4n = 16
atau
m  +2n = 8
m + 5n = 17
kurangkan
-3n = -9
n =3

m+ 2n = 8
m+ 6 = 8
m = 2

a) m + n = 5
b) m-n = -1

2. soal tidak lengkap/ tidak jelas

3. AP  : PB= 1; 2
PB  = 2 AP
b-p = 2(p-a)
b = 2p - 2a + p
b = 3p - 2a

4.  A = BC
a = c - b
C = A + B
C = (8, -5, -1)

5.
u = b-a = (2,2,0)
v = c-a = (1,1,4)
u.v = (2+2+0)= 4
u - v = (1,3,-4)