Question

Verifique se os pontos sao colineares e justifique:a (1,2),(2,3),(3,4) b (-4,1),(-3,0),(-2,-1)

Answer 1

$\left|\begin{array}{cccc}1&2&3&1\\2&3&4&2\\\end{array}\right|=|3+8+6-4-9-4|=|17-17|= |0|=0$
São colineares.
$\left|\begin{array}{cccc}-4&-3&-2&-4\\1&0&-1&1\\\end{array}\right| =|0+3-2+3+0-4|=|6-6|=0 \\ |0|=0$
São colineares.