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4x+2y=12
4x+2(7-3x)=12
4x+14-6x=12
4x-6x=12-14
-2x=-2
x=1
3x+y=7
3(1)+y=7
y=7-3
y=4
Nilai 5x-y=5(1)-4 =1
Jadi nilai 5x-y=1
PLEASE....
JADIKAN SOLUSI TERBAIK YAH ^-^!!
y= -3x+7 4x+2(-3x+7)=12
y= -3(13)+7 4x+(-6x)+14=12
y= -39+7 4x+(-6x)=12+14
y= -32 -2x=26
x=26/2
x=13
Maka: 5x-y=...?
5(13)-32=...?
65-32 =33 hasilnya: 33
Semoga bermanfaat ^_^ *) Beri nilai ya (Y)