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Suppose we have the following equations Demand curve: Qd = -1,450-25Px+12.5Py+.2(Inc) Supply Curve: Qs = -100+75Px-25Py-12.5Pz+10R...

Suppose we have the following equations

Demand curve: Qd = -1,450-25Px+12.5Py+.2(Inc)

Supply Curve: Qs = -100+75Px-25Py-12.5Pz+10R

Q= quantity

px = price of good x

Inc = income = $8000

R = Rainfall = 20

Py = price of product y = $5

Pz = price of product z = $8

I need to find the Income elasticity of demand.

I need the cross price with Y in supply too

How does Z occur in D+S

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