Vector Addition and Resultant Force

[Gebraroest]

Homework Statement

Two forces act on an object. The angle between them is 50°. One force is 150 N. The resultant force is 200 N. Find the second force and the angle that makes it resultant.
Use Cartesian vector methods to solve your problem.

Homework Equations

The Attempt at a Solution

I have the force one as u = [150, 0]
Resultant is [150 + vx, 0 + yx]
This means 200^2 = (150 + vx)^2 + (yx)^2
I have no idea what to do from now on, any help is greatly apprecieted

 

[SteamKing]

You know the angle between the two component vectors forming the resultant. Don't you think you could use that?