Question

As retas x+ky=3 e 2x-y=-5 são paralelas, logo quanto vale k?

Answer 1

Retas :
$z:x+ky-3=0$
$w:2x-y+5=0$
$\frac{1}{2}= \frac{k}{-1}= \frac{-3}{5} \\ k=-2$