Which of the following statements is correct regarding the linear programming model below?
1) The objective function is to maximize 2x + 3y
2) The first constraint is 3x + 5y ≤ 50
3) The second constraint is 4x + 3y ≤ 36
4) The third constraint is 2y ≤ 30
5) The variables x and y are both non-negative
