Let P denote the price of a product that is produced using a single input whose price

Question:

Let P denote the price of a product that is produced using a single input whose price is W. The demand function for the product is Qd = 10 -, and the supply function is Qs = if P > Wand Qs = 0 if P ≤ W. How does the equilibrium price depend on W? What is the elasticity of the equilibrium price P with respect to W when W = 1?