Electric Field and point charges problem

[Roshio6969]

A point charge q_1=-4.00\;{\rm nC} is at the point x = 0.600 m, y = 0.800 m, and a second point charge q_2=+6.00\;{\rm nC} is at the point x = 0.600 m, y = 0.

Calculate the magnitude of the net electric field at the origin due to these two point charges.

 

[Pyrrhus]

What have you done? Start setting up the vectors.