JAMB - Mathematics (1999 - No. 39)

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