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Nomor 83x - 2y = 2 |×2| 6x - 4y = 4
-4x + 4y = 0 |×1| -4x + 4y = 0 +
-------------------------
2x = 4
x = 2
Subtitusikan nilai x = 2 ke pers. 3x - 2y = 2
3x - 2y = 2
3(2) - 2y = 2
6 - 2y = 2
2y = 4
y = 2
Jadi
x + 2y
= 2 + 2(2)
= 6 ==> A
Nomor 9 ==> jawabannya C.20