# Math Help - Cramer's rule

1. ## Cramer's rule

Im trying to solve this using Cramer's rule. Having trouble with doing initial rearranging into Ax=b

C=α+βY
I=γ+θr
Y=C+I

2. Originally Posted by molimoli
Im trying to solve this using Cramer's rule. Having trouble with doing initial rearranging into Ax=b
C=α+βY
I=γ+θr
Y=C+I
C, α, β, Y, I, γ, θ, r

You have both an upper case Y and a lower case y.
You have eight (8) variables.
The Cramer's rule that I use, requires n equations for n variables.

Could you elaborate?

3. the lower case y is a gamma. and the a an alpha. Sorry i cannot seem to make the equations bigger.

Y C and I are endogenous
r is exogenous
alpha, beta, gamma and theta are known constants