draw the feasible region fulfilling
{{{x+2y<=0}}},{{{x-y<=4}}},{{{x>=1}}},{{{y>=-1}}}
Really appreciate it.
x-y<=4 does not affect the solution provided by the other three constraints. It's just a triangle with vertices at
(1,-1) (1,-1/2) (2,-1)
{{{x+2y<=0}}},{{{x-y<=4}}},{{{x>=1}}},{{{y>=-1}}}
Really appreciate it.
(1,-1) (1,-1/2) (2,-1)