Hitunglah: a. x dan y! b. x + y! Tolong jawaban nya

3x = 5x - 48
3x - 5x = - 48
- 2x = -48
x = 24

2y = 180 - 3x
2y = 180 - 72
2y = 108
y = 54

x + y = 24 + 54
x + y = 78