Forming equations using proportion by Boxed Rockets

Form Equations to Represent the Following

Question 1:

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

y = \frac{44}{x}

Question 2:

y is inversely proportional to x, when x = 6, y = 15

y = \frac{90}{x}

Question 3:

y is directly proportional to x, when x = 7, y = 70

y = 10 x

Question 4:

y is inversely proportional to x, when x = 5, y = 10

y = \frac{50}{x}