Question

Which is an equation of a direct proportion? a. y=-2x b. y=1/2x-2 c.y=-2x+3 d. y=4/x

Answer 1

Answer:

a. y=-2x

Step-by-step explanation:

The equation of a direct proportion is of the form $y=kx$ where k is the constant of proportionality.

From the given options, the only equation that is of the form, $y=kx$ is

$y=-2x$.

In this case $k=-2$ is the constant of proportionality.

Therefore the correct option is A.