Solve the linear programming problem by the method of corners.
Minimize C = 3x + 7y
subject to 4x + y ≥ 39
2x + y ≥ 29
x + 3y ≥ 42
x ≥ 0, y ≥
Minimize C = 3x + 7y
subject to 4x + y ≥ 39
2x + y ≥ 29
x + 3y ≥ 42
x ≥ 0, y ≥