Each of the graphs should be matched to the choices as follows;
Graph 1 ↔ A. solution.
Graph 2 ↔ B. not a solution.
Graph 3 ↔ B. not a solution.
Graph 4 ↔ A. solution.
The 4-letter code is ABBA.
In Mathematics, there are several rules that are generally used for writing and interpreting an inequality or system of inequalities that are plotted on a graph and these include the following:
- The line on a graph should be a dashed line when the inequality symbol is (> or <).
- The inequality symbol should be less than (<) when a dashed line is shaded below.
- The inequality symbol should be greater than or equal to (≥) when a solid line is shaded above.
Generally speaking, the points that lies below or above the boundary line of a linear inequality represent the solution set. Thus, the region shaded below or above the boundary line of a linear inequality represent the solution set.
If a boundary line is a dashed line, any point that lies on it is not a solution to the linear inequality. However, if the boundary line is a solid line, any point that lies on it would be a solution to the linear inequality