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2x +y = 5 Ι x5 Ι 10x +5y = 25 -
-11y = -11
y = 1
5x -3y = 7
5x -3(1) = 7
5x -3 = 7
5x = 7 +3
5x = 10
x = 2
Maka, nilai :
3x -4y
= 3(2) -4(1)
= 6 -4
= 2
Jad, jawabannya adalah c.