Can someone plz help me with this one problem

What is the reflection image of (5,-3) across the line y = -x?

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

If you answer 2+2 you will get over 80 points