p1:=plot3d([x,y,ln(2*x+y)],x=-2..-0.5,y=1..4,color=yellow, axes=framed,style=patch):

p2:=plot3d([x,y,-1+2*x+y],x=-1.5..-0.5,y=2..3,color=maroon):

display3d({p1,p2});