A linear expression appears below; the powers of its variables x and y are equal to one.

2x – 3y

A linear constraint requires a linear expression to be equal to a number, to be less/greater than or equal to a number.

x + y = 4

x – 3y ≤ 2

x ≥ y

The last expression stated above is called a non-negativity constraint, which requires the value x to be greater or equal to zero. A linear program either minimizes or maximizes a linear expression subject to defined linear constraints. The correct answer is E.