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2x + 4y = 8
Barisan atas dikaliin 4.
-12x + 4y = 36
2x + 4y = 8
____________-
-14x = 28
x = -2
-3x + y = 9
-3.-2 + y = 9
6 + y = 9
y = 9-6
y = 3
Jadi nilai -x + 2y
-(-2) + 2.3
2 + 6
8
Nilainya 8
Semoga membantu :)