Question

Determine m para que A, B e C sejam colineares: A(-12,-13), B(-2,-5) e C(3,m)

Answer 1

|-12 -13| |-2 5| |3 M| |-12-13| 60-2M-39-26+15+12M=0 M=-10/10 M=-1

Answer 2

Olá Bernellys

-12  -13   1
  -2    -5   1
   3    m   1
-12  -13   1
  -2    -5    1

det = 60 - 2m - 39 + 15 + 12m - 26 = 0

10m = 65 - 75 = -10

m = -1