The document discusses solving an inequality involving variables x and y. It shows how to write the inequality x + y ≥ 4 as an equation in slope-intercept form, with a slope of -1 and y-intercept of 4. It then lists six inequalities that define the ranges of x and y: x + y ≥ 4 and x + y ≤ 8, with x ≤ 5, y ≤ 5, x ≥ 0 and y ≥ 0. This system of inequalities describes the region 0 ≤ x ≤ 5 and 4 ≤ y ≤ 8.