Could you please help me step by step with this question?

Thank You!

An economic consultant for Amazon-Prime recently provided the firm's marketing manager with this estimate of the demand function for the firm's product:

Qx= 14,200 -2Px + 5Py +2M + 2Ax

Where Qx represents the amount consumed of good X, Px is the price of good X, Py is the price of good Y, M is income, and Ax represents the amount of advertising spent on good X. Suppose good X sells for $200 per unit, good Y sells for $15 per unit, the company utilizes 2,100 units of advertising, and consumer income of $12,000. How much of good X do consumers purchase? Are goods X and Y substitutes or complements? Is good X a normal or an inferior good?