Question

Determine o valor de M para que A=(2,-3) B(-6,5) e C=(M,-5) sejam colineares. 

Answer 1

 

$<var> Det = \left[\begin{array}{ccc}2&-3&1\\-6&5&1\\M&5&1\end{array}\right] = 0 10-3m -30 -5m -10 +18=0 -8m -12 = 0 -8m=12 m=12/-8 m= - 1,5</var>$

Espero ter ajudado ;)