Question

Jika x + 2y = 8
maka y = ......
jika 2x + 3y - 12 =....
maka y =.......

Answer 1

1. x+2y=8
    4+(....×2)=8
    8-4=4
    4:2=2
2.diket: x=4
            y=2
   
   2x+3y-12
   (4×2)+(2×3)-12
   8+6-12
    14-12=2

maaf kalau salah atau caranya tidak benar

Answer 2

X + 2y = 8
  x = 8 - 2y

2x + 3y - 12 = 0
2(8 - 2y) + 3y -12 = 0
16 - 4y + 3y - 12 = 0
y=4

x = 8 - 2y
x = 8 - 2(4)
x = 0