1. These are Elementary Row Operations (EROs):

a. Multiply a row by a non-zero scalar

b. Add a row to another row

c. All of the above

d. None of the above

2. If we include an additional constraint to a linear program, its new feasible region:

a. Remains the same

b. Is now bigger

c. Is now smaller

d. a) or b)

e. a) or c)

3. If we have a >= constraint with all variables on the LHS, all we need to do to reexpress it as an equation is subtract an slack variable

True

False

4. In a min problem, the optimality test consists in verifying that the reduced costs for all non-basic variables are non-positive

True or False