tolong donk bahan ulangan...

P, Q, R segaris jika
PQ = k QR
(q - p) = k (r - q)
((2a - b - 2c) - (-a + 5b + 4c)) = k ((3a + nb + mc) - (2a - b - 2c))
(3a - 6b - 6c) = k (a + (n + 1)b + (m + 2)c)
(3a - 6b - 6c) = (ka + k(n + 1)b + k(m + 2)c)

3a = ka => k = 3

-6b = k(n + 1)b
-6 = 3(n + 1)
-2 = n + 1
-3 = n

-6 = k(m + 2)
-6 = 3(m + 2)
-2 = m + 2
-4 = m