Question

Which does not show a direct variation between x and y?

A.
y =

B.
y = 2x

C.
y = 0.5x

D.
y =

Answer 1

D. y= x/y

Answer 2

what is in A?

Answer 3

Direct variation is in the form
y=kx
where k is a real numeric constant.
Examples:
y=4x,
y=sqrt(23)x
y=(3/2)x

Examples that are NOT direct variations
y=(4/3)x*x
y=x/y^2
y=x+3
y=2x-pi

Answer 4

\[y=\frac{ k }{ x }\]
here x and y are in indirect variation.