Find the equilibrium

Jul 2008
212
2
What is the equilibrium of Pa = 61 + 0.5Pb and Pb = 61 + 0.5Pa

I got 61 as the answer, can someone verify?
 
Dec 2009
872
381
1111
What is the equilibrium of Pa = 61 + 0.5Pb and Pb = 61 + 0.5Pa

I got 61 as the answer, can someone verify?
Dear brumby,

Do you want to solve these two equations to obtain values for Pa and Pb ?? Is that what you mean by equilibrium?