Does the equation 7x-4y=0 represent a direct variation? what is the constant of variation?

yes, k =

Step-by-step explanation:

The equation representing direct variation is

y = kx ← k is the constant of variation

rearrange 7x - 4y = 0 into this form

subtract 7x from both sides

- 4y = - 7x ( divide both sides by - 4 )

y = x ← in standard form

with k =

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce