The column is vertical. Observing the process of obtaining the unit median, we can get the equation Y2×X2=Y 1×X 1.

Then substitute numbers, assuming that Y2 is 2 and X 1 is 6, then Y 1 and X 1 are 3 or 4.

Two equations are obtained:

32×46=64×23 or 42×36=63×24.

If Y2 is 3 and X2 is 8, then Y 1 and X 1 are 6 or 4.

Two equations can also be obtained:

63×48=84×36 or 43×68=86×43.

In the same way, you can get different equations by slowly finding numbers to substitute.