Or:
The graph of x ≥ 0 and y ≥ 2x looks like this:
The graph of x ≤ 0 and y ≤ 2x looks like this:
Together they make the graph in the figure.
Or:
The graph of x ≥ 0 and y ≥ 2x looks like this:
The graph of x ≤ 0 and y ≤ 2x looks like this:
Together they make the graph in the figure.