Correct option is (D) Q4
x > 0, y < 0
Then x > 0, -y > 0
\(\Rightarrow\) x - y > 0
Now, y - x = -(x - y)
\(\Rightarrow\) y - x < 0 \((\because\) x - y > 0)
\(\because\) x - y > 0 & y - x < 0
Therefore, (x - y, y - x) lies in \(Q_4\) \((4^{th}\) quadrant)