X int is 4. The slope is 4,3. This means that every time the x coordinate goes up 1 the y coordinate goes down bye 1. Hope this Helps!
The first angle given is not needed. it is extra info.
so to start off you need to see that it is a subtraction problem. it is angle BEF minus angle GEF
90 degrees minus 39 degrees then it is all math.
angle BEG = 51 degrees
Symmetric property, I remembered the answer for this for my summer school. This is one of the equivalence properties of equality.
A way to add fractions that always works is to multiply each numerator by the denominator of the other, then express the sum of products over the product of the denominators.

Here, you have
The sum is -1 1/12