Zero Electric Field Calculation for Point Charge System

[kidxsai]

Would someone help me solving this problem?
A charge of -3.26 C is located at the origin, and a charge of -5.36 C is located along the y-axis at 1.73664 m.
K is given. At what point along the y-axis is the electric field zero?

Homework Equations

The Attempt at a Solution

 

[dextercioby]

C'mon, the problem is simple. Can you add 2 vectors ?