Which one of the following is not a basic solution of system of linear equation
x1 + 2x2 + x3 = 4
2x1 + x2 + 5x3 = 5
1
x1 = -1, x2 = 2, x3 = 1
2
x1 = 2, x2 = 1
3
x1 = 5, x3 = -1
4
x2 = 5/3, x3 = 2/3
Which one of the following is not a basic solution of system of linear equation
x1 + 2x2 + x3 = 4
2x1 + x2 + 5x3 = 5