the shaded portion in the graph is represented by
- y + x - x \(\leq\) 0, y - x \(\leq\) 0
- y - x + x, 3 \(\leq\) 0, y - x \(\geq\) 0
-
y + x - 3 \(\geq\) 0, y + x \(\leq\) 0
- y - x + x3 \(\geq\) 0, y + x \(\leq\) 0