Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

y is inversely proportional to x, when x = 6, y = 5

y = \frac{30}{x}

Question 2:

y is directly proportional to x, when x = 9, y = 90

y = 10 x

Question 3:

y is directly proportional to x, when x = 11, y = 77

y = 7 x

Question 4:

y is inversely proportional to x, when x = 11, y = 4

y = \frac{44}{x}