Question

Qual o valor de x para que os pontos (1, 3), (3, 5) e (x, 1) sejam colineares?​

Answer 1

Resposta:

x = - 1

Explicação passo a passo:

$\left|\begin{array}{cccc}1&3&x&1\\3&5&1&3\end{array}\right|_{+}^{-}=0\\\\|1.5 + 3.1 + x.3 -3.3-5.x-1.1|=0\\\\|5+3+3x-9-5x-1|=0\\\\|-2x-2|=0\\\\-2x-2=0\\\\2x+2=0\\\\2x=-2\\\\x=-1$