PQRS is a kite. Points P, Q and R are plotted on the diagram.
P is the point (0, 1) and R is the point (4, 5).
angle PQR = 90°
The point Q lies on the y-axis.
The line PS is a segment of the line 2y + x = 2
The coordinates of S are ( l, m).
What is 2l + m ?

Answer: