Question

Encontre o valor de c para que os pontos (11,3) (2.c ) e (14-3) sejam colineares?

Answer 1

$\left[\begin{array}{ccc}11&3&1\\2&c&1\\14&-3&1\end{array}\right] = 0 \implies 11c + 42-6-14c+33-6=0 \implies \\ \implies -3c + 69 = 0 \implies c = 23$