Question

y is 27 when x is 3

Answer 1

There's not enough information here to say what an answer is.

Answer 2

y=x^x

y=9x

These are some possible functions.

Answer 3

y=27 and x=3
so we see that y is 9 times greater, your variation would look like \[\color{blue} {y=9x}\]

Answer 4

its that or u just graph the point:3, 27...