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 [tex] \leq [/tex] sign.
So, the point [tex] (1,1) [/tex] is below the line but above the parabola (blue area), so it is not a solution.
The point [tex] (2,2) [/tex] is above both the line and the parabola (white area), so it is not a solution.
The point [tex] (-1,0) [/tex] is below both the line and the parabola (red area), so it is a solution.
So, the point [tex] (4,1) [/tex] is below the parabola but above the line (green area), so it is not a solution.
