You produce good X and another firm produces good Y$.$ Last year you raised your price $10\%$ and your quantity sold dropped $6\%,$ and Y$\text{'}$s price didn't change. This year, you kept your price the same but Y raised their price $10\%-$ and your sales dropped $4\%.$ Assuming other conditions remained the same, what can we conclude?

X is elastically demanded, and X and Y are substitutes.

X is inelastically demanded, and X and Y are substitutes.

X is elastically demanded, and X and Y are complements.

X is inelastically demanded, and X and Y are complements.