determine if this question is true or false and explain why.How might I go about determining this?

Suppose the demand function for some good X is given by QDx = 1000 – 5Px + 3Py + 12M,

Suppose the demand function for some good X is given by QDx = 1000 – 5Px + 3Py + 12M,

Question
Suppose the demand function for some good X is given by QDx = 1000 – 5Px + 3Py + 12M, where QDx is the quantity of x demanded, Px is its price, Py is the price of good Y, and M is average consumer income
. This good is normal and goods X and Y are substitutes
. [Hint: Determine the sign of the income and cross-price elasticity]

I am supposed to determine if this question is true or false and explain why
. How might I go about determining this?

Suppose the demand function for some good X is given by QDx = 1000 – 5Px + 3Py + 12M,

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