1.

f=[-3,-1,0,0];
A=[2,-1,0,0];
b=[12];
Aeq=[3,3,1,0
    4,-4,0,1];
beq=[30,16];
lb=[0,0,0,0];
ub=[];
[x,y] = linprog(f,A,b,Aeq,beq,lb,ub)

Optimal solution found.

x =
6.999999999999999
3.000000000000000
0
0
y =
-23.999999999999996

2.

f=[-2,-1,3,-5];
A=[1,2,4,-1
    2,3,-1,1
    1,0,1,1];
b=[6,12,4];
Aeq=[];
beq=[];
lb=[0,0,0,0];
ub=[];
[x,y] = linprog(f,A,b,Aeq,beq,lb,ub)

Optimal solution found.

x =
0
2.666666666666667
0
4.000000000000001
y =
-22.666666666666671