Chapter 9, Problem 77RE

(a)

To determine

Two inequalities that express the fact that cannot use a negative number of acers to plant orange and grapefruit trees.

(b)

To determine

Two inequalities that express the fact that the total number of acers used for growing orange and grapefruit trees is at most 100.

(c)

To determine

Two inequalities that express the fact that the farmer wants to plan at least 4 times as many orange trees as grapefruit trees.

(d)

To determine

To graph: The feasible region formed by the inequalities $x\ge 0$, $y\ge 0$, $x+y\le 100$, $x\ge 4y$.