If the price of $"x$ increases and you buy less of $"Y"$ then...

a$)"x^{\text{'}\text{'}}$ and ${?}^{\text{'}\text{'}}\text{'}$ are complements and the price of $"Y^{\text{'}\text{'}}$ will increase.

b$)"x\text{'}$ and ${?}^{-}Y$ are complements and the price of $Y^{\text{'}\text{'}}$ will decrease.

c$)"x"$ and $Y^{\text{'}}$ are substitutes and the price of $-Y"$ will increase.

d$)x^{\text{'}\text{'}}$ and $Y^{\text{'}\text{'}}$ are substitutes and the price of $Y^{\text{'}\text{'}}$ will decrease.