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Step-by-step explanation:

We're discussing direct proportion here.  Which of the listed examples have the form y = kx?  (k is the constant of proportionality)

y = 0.04x (k = 0.04)

x = y/2 can be rewritten as y = 2x; k = 2

y = -11x

x/y = 9 can be rewritten as 9y = x, or y = (1/9)x

All four of the above display direct proportion.

x - 5 = y does not pass thru the origin; its y-intercept is (0, -5).  Not a  proportional relationship.

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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