Tolong Jawab ya Pakai cara

x - 3y = 2y + 1

x - 3y + 2y + 1 = x - y + 1
180 - x + y - 1 = 10x + 2y
179 = 11x + y
y = 179 - 11x

x - 3(179 - 11x) = 2(179 - 11x) + 1
x - 537 + 33x = 358 - 22x + 1
34x - 537 = 359 - 22x
56x = 896
x = 16

16 - 3y = 2y + 1
5y = 15
y = 3

x - 3y = 7°
2y + 1 = 7°
10x + 2y = 166°

semoga bisa membantu...