"Well, you must read the text well and identify three things : "
"1) The linear function that has to be maximized/minimized"
"2) The variables, those occur in the linear function of 1)"
"3) The constraints are also a linear function of the variables,"
"and that function has to be ">=" or "<=" a number."
"Sometimes there is a constraint =, but then we can eliminate"
"a variable by solving for that variable and substituting in the "
"other functions."