Does y varies directly with x if y54 when x 6?

Answer 1

y=54 if x=6

so we can write

y=9(x)

so y=k(x)

clearly y is directly proportional to x.

Answer 2

y=54 when x=6

Therefore, y= 9x

y=kx, where k is any constant, so y varies directly with x.

Answer 3

Actually, there is not enough information to say that y is proportional to x. There are infinite functions that go through this point.