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caranya :
3x-2y=27 }dikali 5 = 15x-10y=135
5x+3y=26}dikali 3 = 15x+9y=78 _
-19y=57
y=57 / -19
y= -3
subtitusikan nilai y = -3 ke persamaan 3x-2y = 27
3x-2y=27
3x-2(-3)=27
3x+6=27
3x=27 - 6
3x=21
x=21/3
x=7.
dari penyelesaian diatas diperoleh nilai x=7 dan y= -3
maka x-2y = 7-2(-3)=7+6= 13
jawabannya d.13