Question

If y is inversely proportional to x and y=9 when x=3. Find x when y=12

Answer 1

Y=k/x
9=k/3
9*3=k
27=k
Therefore
Y=27/x

When y=12
12=27/x
X= 12/27
X= 4/9

Answer 2

9/4

Variables in inverse proportion have a constant product.

`xy=(9)(3)=27 \\ \\ xy=12x=27 \\ \\ x=(9)/(4)`