Because of the inequality symbol shown (>), the boundary line must be dashed (not solid).
The sum of 5x and y must therefore be greater than -10. If, for example, x=0, then y>-10. Focusing on x: If y=0, then x must be greater than -10/5, or -2.
Graph the points (0,-10) and (-2,0) and draw a dashed line through them. Shade the area above (to the right of) this dashed line.