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-y=-3x+15
Y = 3x - 15
Subtitusi ke pers 2
X + 3y = 3
X + 3.(3x-15)=3
X+9x-45=3
10x = 48
X =4,8
Y=3x-15
Y = 3.4,8-15
Y=14,4-15
Y= - 0,6
Jadi, x-2y = 4,8-2.(-0,6)=4,8+1,2=6