tolong yaa :) ....................

diketahui :
a + b + c = 2
b + 3c = 5
c = 2

jawab :
# mencari bil. kedua
b + 3c = 5
b + 3x2 = 5
b + 6 = 5
b = 5 - 6
b = -1

# mencari bil. pertama
a + b + c = 2
a + (-1) + 2 = 2
a + 1 = 2
a = 2 - 1
a = 1