First, you must find out what the similarity is between the two triangles to use it as a point of reference for the rest of the equation.
In order to find x, divide 20 by 5, this equals 4. now divide 28 by 4. This equals 7. So x equals 7.
Now we need to find y. The angle of the smaller triangle is 120. Since the triangles are similar, that means the angle is the same for both triangles. So y equals 120.
Hope this helps!
