你好，请教一个线性规划的问题，我用sas or做了这样一个问题
data b;
input x1 x2 a b _type_ $ _rhs_;
datalines;
0 0 1 -1 min .
6 8 -1 0  eq 10
8 12 0 1 eq 10
;
run;
proc lp data=b;run;

本来书上是说最优参数出来是x1=0.4,x2=0.6但我这
里的程序显示是x1=1.25 x2=0,并且log显示
ERROR: Infeasible problem. Note the constraints in the constraint summary that are identified as infeasible. If none of the
       constraints are flagged then check the implicit bounds on the variables.

不知道错哪？谢谢