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2x -4y = 14 Ι x3 Ι 6x -12y = 42 -
16y = -48
y = -3
3x +2y = -3
3x +2(-3) = -3
3x +(-6) = -3
3x = -3 +6
3x = 3
x = 1
Maka, nilai dari :
4x -3y
= 4(1) -3(-3)
= 4 +9
= 13
Jadi, jawabannya adalah c.