By maximization or minimization of linear functions.

I'll assume that we're working with word problems here. Based on how the lessons formatted their sample problems I think you would need to find first the amount of 'resources' (could be time, materials,  etc.) to do a process/es, these will go to the left hand side of the constraint equation. For the right hand side you would need to find the upper or lower limit of the resources that you can use at the moment/day/week/etc.

Express the restrictions, demands, and connections between variables from the problem's context into inequality or equality problems involving the decision variables to find constraints in linear programming.