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1=y1
2=x2
3=y2
persamaan garis:
y-y1/y2-y1=x-x1/x2-x1
y-1/3-1=x-(-4)/2-(-4)
y-1/2=x+4/6
(kali silang)
2x+8=6y-6
2x-6y+8+6=0
2x-6y+14=0