# Sensitivity on A Farmer's Case

I have questions, from Bazaraa's book (Linear Programming).

I have calculated point a. This is the optimal table.

Where $$x_1$$ is wheat, $$x_2$$ is corn, dan $$x_3$$ is soybeans.

My question is, what the meaning of point b.? Is that true if the point c. is adding a constraint $$x_1\geq 120$$?