nomor 4 & 5 saja kumpul bsk

4. X+2y=3 | x3 (dikali 3)
X+3y=4 | x2 (dikali 2)

3X+6y=9
2X+6y=8
————— –
X + 0 = 1
X = 1

X+2y=3
X+3y=4
———— –
0 -y = -1
-y = -1

Maaf kalau Salah :)