How to solve two equations for four unknowns?

How to solve the follwoing system for x and y in Matlab?

syms x y b r
E1=x - y == x/(1+log(b*y+1));
E2=exp(r*(1-x))== 1+log(b*y+1);
sol = solve(E1,E2,{x,y})

Answer 1

[Alex Alex]

No options, the number of equations must be greater than or equal to the number of unknowns. Now 2<4?