The red area is the one which solves the system. In fact, we want the area which below both the parabola and the line (since the inequality features a sign.
So, the point is below the line but above the parabola (blue area), so it is not a solution.
The point is above both the line and the parabola (white area), so it is not a solution.
The point is below both the line and the parabola (red area), so it is a solution.
So, the point is below the parabola but above the line (green area), so it is not a solution.