Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

y is directly proportional to x, when x = 10, y = 120

y = 12 x

Question 2:

y is inversely proportional to x, when x = 9, y = 7

y = \frac{63}{x}

Question 3:

y is directly proportional to x, when x = 4, y = 44

y = 11 x

Question 4:

y is directly proportional to x, when x = 2, y = 28

y = 14 x