Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

y is inversely proportional to x, when x = 10, y = 14

y = \frac{140}{x}

Question 2:

y is directly proportional to x, when x = 8, y = 112

y = 14 x

Question 3:

y is directly proportional to x, when x = 6, y = 66

y = 11 x

Question 4:

y is directly proportional to x, when x = 12, y = 108

y = 9 x