Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

y is directly proportional to x, when x = 4, y = 20

y = 5 x

Question 2:

y is directly proportional to x, when x = 11, y = 66

y = 6 x

Question 3:

y is inversely proportional to x, when x = 12, y = 10

y = \frac{120}{x}

Question 4:

y is inversely proportional to x, when x = 4, y = 14

y = \frac{56}{x}