Answer:
It's (a).
Step-by-step explanation:
Y ≥ 1:
The line y = 1 is a horizontal passing though the point on the y axis where y = 1 and y ≥ 1 is the area above this line,. The area is shaded above this line,
Y ≥ x - 1:
The line y = x - 1 is a line which rises to the right with gradient 1 and which passes through the point (0, -1) on the y axis. Y ≥ x - 1 is the area above the line and is shaded.
The combination of these 2 inequalities gives us diagram (a). The shaded part satisfies both inequalities.
