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x + 2y=4
metode eliminasi
4x=-8
x= -8/4
x= -2
metode substitusi mencari y
x+2y=4
-2+2y=4
2y=6
y=3
tinggal dimasukkan
2x+5y=2×-2 + 5×3
= -4 + 15
= 11