take the right angle 90 divid it by two you get 45 and that is the answer for Y
take the right angle on the other side 90 and minus 36 and you get 54 which is 2x
54 minus 36 is 18
54 divided by two is 27 turn 27 into an x for 2x
x is 27 so 4 times 27 is 108
x-27 y-45 4x-108 2x-35=18