Final answer:
The solution set for the inequality y≥x+1 is represented by the graph (a) from Figure 12.4, where the line slopes upward to the right and the shaded area above the line represents all the points that satisfy the inequality.
Step-by-step explanation:
The solution set for the inequality y≥x+1 is represented by the graph (a) from Figure 12.4. In this graph, the line slopes upward to the right, indicating that as x increases, y also increases. The shaded area above the line represents all the points that satisfy the inequality.