Penyelesaian sistem persamaan 4x – y = 11 dan x + 3y = -7 adalah
Jawaban Terkonfirmasi
4x – y = 11 | 3 | 12x – 3y = 33
x + 3y = -7 | 1 | x + 3y = -7 +
13 x = 26
x = 26 / 13
x = 2
4 x – y = 11
4 ( 2 ) – y = 11
8 – y = 11
-y = 11 – 8
-y = 3
y = -3
4x – y = 11 | * 1| 4x -y = 11
x + 3y = -7 | * 4| 4x +12y = -28
—————- –
-13y = 39
y = -3
x + 3y = -7
x + 3(-3) = -7
x -9 = -7
x = -7 + 9 = 2