Question

Y varies directly with x , and y is 84 when x is 16 .which equation represents this situation?

A) y=100x
B) y=5.25x
C) y= 1344x
D) y= 4/21x

Answer 1

`(y)/(x) = (84)/(16) \\ = > (y)/(x) = (21)/(4)`

`y = (21)/(4) x`

I think option D will be 21x/4

Answer 2

B : y=5.25 I took the quiz and this was the correct answer