can you explain to me how to understand questions please

The demand for good X is given by the equation QX= 125 - 2 PX+ 3 PY- 0.5 I, where PYis the price of a related good, and I is income. Which of the following is true:

None of the other options is correct.

Good X is an inferior good.

Good X and Y are complements.

Good X is a normal good.

The demand for good X is given by the equation QX= 125 - 2 PX+ 3 PY- 0.5 I, where PYis the price of a related good, and I is income. Which of the following is true:

Goods X and Y are complements.

Goods X and Y are substitutes.

Impossible to answer with the information given.

Goods X and Y are unrelated.