Is there any method/way to determine the impact on demand/supply function
QD = a - bP/ QS = a + bP
due to change in factors like Price,Tax,Subsidy,Future Prices,price of complementary and substitute goods etc

Dear student, 

The standard demand and supply equations are based on the relationship of quantity demanded and quantity supplied respectively with the price of the commodity only while assuming that other things remain the same. 
The impact of factors other than price is not depicted by the demand equation and supply equation. 

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Simple method is to put the value of factors..... Because factors ke value me change hone ke karan hi demand ya supply me change hota hai..!!!
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