Question

Determine a equação geral da reta que passa pelos pontos (-1,2) e (3,4). *
2 pontos
2x+4y+10=0
-2x+4y-10=0
3x-4y-5=0
-3x+4y+5=0
Nenhuma das alternativas

Answer 1

$\huge\begin{vmatrix}-1&2&1\\3&4&1\\x&y&1\end{vmatrix}=0$

$\mathsf{-1(4-y)-2(3-x)+1(3y-4x)=0}\\\mathsf{-4+y-6+2x+3y-4x=0}\\\mathsf{-2x+4y-10=0}\\\huge\boxed{\boxed{\mathsf{\maltese~~Alternativa~b}}}$