Since the triangle is an equilateral triangle, angle C is equivilant to angle A. Thus, 73 = 8y-7 y = 10 Since y = 10, you can use the fact that a triangle is 180 degrees to find out x by using 73 + 73 + 6x + 4 = 180. X = 5
P.S. When doing part 2, plug in y