Question

Determine o valor de a para que os pontos (6, 4), (3, 2) e (a, -2) sejam colineares.

Answer 1

Resposta:

a = -3

Explicação passo a passo:

$\left|\begin{array}{cccc}6&3&a&6\\4&2&-2&4\\\end{array}\right|_-^+=0\\\\|6.2+3.(-2)+a.4-4.3-2.a-(-2).6|=0\\\\|12-6+4a-12-2a+12|=0\\\\|2a+6|=0\\\\2a+6=0\\\\2a=-6\\\\a=\frac{-6}{2}\\\\a=-3$