Question

y and x ​have a proportional relationship, and y = 30 when x = 3. Which equation represents this relationship? A. y= 1/10 x B. y=110x . x = 27y D. y = 10 x = 10y

Answer 1

The answer would be:  D. y = 10x

The value of y is 30 when x is 3. Then, the ratio of y:x would be: 30/3=10
That means Y would be 10 times more than X. Then, the right choice would be: y = 10 x 
You can check it by inserting the number(y=30. x=10) like this:
 y = 10 x 
30= 10(3)
30= 30