Here is what I'm dealing with:
I know y would be 49, but I don't know how to find the value of x. I'm a beginner at Geometry, so hopefully someone can explain this to me in a way that I understand.
I labeled your triangle.
Consider triangle BCD. I mentioned previously that the sum of the measures of the angles in a triangle equals 180. Therefore:
x+46+90=180
What you did was x+y+46=180, which is incorrect. The measure of angle B is not x. As you can see, there is an angle bisector that divides angle B into 2 congruent angles(<CBD and <DBA)