Hi,

I am wondering what to do with this question

Minimize 2x1 - 3x2

with constraints

A: -3x1 + x2 = 90

B: 4x1 + 2x2 = 120

C: x1 + 2x2 = 150

The first constraint works out to be: x1= -30, and x2 = 90. I don't think this is right because you cannot have a negative number in a linear model.

Can anyone help me?