Suppose you have the following model: T₁ Bo + B₂m₂ + B₂y + Baye-1 + Use (1) where m (money supply) is exogenous, ris the interest rate and, y is GDP. The data set contains the observed values of these variables. Suppose GDP can be expressed using another equation to form with the first equation a system of two equations: Yeao+are+ U₂t (2) c). Is the system identified? Why?