Respostas

2014-06-05T05:09:28-03:00
Y = mx + n

m = Δy / Δx
-2 = yB - yA / xB - xA
-2 = (4b) - 2 / (2b+1) - 4
-2 (2b + 1 - 4) = 4b - 2
-4b - 2 + 8 = 4b - 2
-2 + 8 + 2 = 4b + 4b
8b = 8
b = 8 / 8
b = 1

B (2b+1, 4b)
B (2.1+1, 4.1)

A (4, 2)
B (3, 4)

Prova:
m = Δy / Δx
m = yB - yA / xB - xA
m = 4 - 2 / 3 - 4
m = 2/-1
m = -2
8 4 8