Question

Qual o valor de K, para que os pontos A (k,2), B (2,3) e C (5,7) estejam alinhados

Answer 1

Resposta:

k = 5/4

Explicação passo a passo:

$\left|\begin{array}{cccc}k&2&5&k\\2&3&7&2\end{array}\right|_{+}^{-}=0\\\\|k.3+2.7+5.2-2.2-3.5-7.k|=0\\\\|3k+14+10-4-15-7k|=0\\\\|-4k+5|=0\\\\-4k + 5 = 0\\\\-4k=-5\\\\4k=5\\\\k=\frac{5}{4}$