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3x -5y=31 x2
-----------------------
20x - 10y = 90
6x - 10y =62
---------------------- -
14x =28
x =2
substitusikan x=2
4(2) -2y =18
-2y =18-8
y= 10:2
y = 5
caranya bisa digunakan untuk mengisi soal selanjutnya. semoga bermanfaat