Question

if x varies directly as y, and x=9 when y=2, find the x when y is 6

Answer 1

if x varies directly as y
then we can say
x=ky where k is consatant of proportionality

Answer 2

hence we can say
9=k*2
so k= 9/2
now when y=6
x = ky
x= (9/2) *6
x=27