In the case of perfect multicollinearity,OLS is unable to estimate the slope coefficients of the variables involved.Assume that you have included both X1 and X2 as explanatory variables,and that X2 = X 
,so that there is an exact relationship between two explanatory variables.Does this pose a problem for estimation?
Definitions:
Refrigeration System
A system designed to remove heat from an enclosed space or from a substance for the purpose of lowering its temperature and/or maintaining it below ambient level.
Receiver/Dryer
A component in a vehicle's air conditioning system that removes moisture from the refrigerant and acts as a storage tank for the refrigerant when the system is not in use.
Passenger Compartment
The area of a vehicle designed to accommodate passengers, excluding the trunk or cargo space.
Boiling Point
The temperature at which a liquid turns into vapor at a given pressure.
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