Question

In which of the following $x$ and $y$ vary directly with each other. For each direct variation, what constant of variation.
$y+4x=0$

Answer 1

Given

$y+4x=0$

From thi $y=-4x$

To vary directly means in the form of $y=\alpha x$

${}^{\prime }{\alpha }^{\prime }$ is the constant

So here $-4$ is the constant of variation