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x+3y=16 x1
21x-3y=6
x+3y=16 +
22x = 22
x=1
x+3y=16
1+3y=16
3y=16-1
3y=15
y=5
x + 3y = 16 dikalikan 1
maka
21x - 3y = 6
x + 3y = 16 +
22x = 22
x = 22/22
x = 1
ambil salah satu garis
x + 3y = 16
1 + 3y=16
3y =16-1
3y =15
y =5
hasil akhir
4x -y = 4 (1) - 5
= 4-5
= -1