Question

Solve graphically : x ≤ 0 and y ≤ 0

Answer 1

Consider the lines whose equations are x = 0, y = 0.These represents the equations of Y-axis and X-axis respectively, which divide the plane into four parts.
Since x ≤ 0, y ≤ 0, the solution set is in the third quadrant which is shaded in the graph.