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OB=-4/-8=1/2
OC=(1/2)/2=1/4
OD=-4/-1=4
B. pers melalui (0,0) y=mx
OA y=(3/7)x
OB y=(1/2)x
OC y=(1/4)x
OD y=4x
C. tark garis yang melalui (0 ,0) dan ke titik titik A,B,C,D ada 4 garis