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Verified answer
2x + y = 12y = 12 - 2x
substitusikan ke persamaan kedua
3x + 4y = 23
3x + 4(12 - 2x) = 23
3x + 48 - 8x = 23
3x - 8x = 23 - 48
-5x = - 25
x = 5
y = 12 - 2x
y = 12 - 2(5)
y = 12 - 10
y = 2