Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

y is inversely proportional to x, when x = 8, y = 4

y = \frac{32}{x}

Question 2:

y is inversely proportional to x, when x = 12, y = 4

y = \frac{48}{x}

Question 3:

y is directly proportional to x, when x = 5, y = 75

y = 15 x

Question 4:

y is directly proportional to x, when x = 5, y = 60

y = 12 x