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y2 - 1 per x2 - 1 = 2/3
y2 -1 = 2
y2 = 3
x2 - 1 = 3
x2 = 4
jadi koordinat yg lain yaitu (4,3)
y-y1=m(x-x1)
y-1=2/3(x-1)
y=2/3x(-2+3)/3
y= 2/3x+1/3
koordinat lain adalah x=4 maka
y= 2/3x+1/3
y=2/3.2+1/3
y=8/3+1/3
y=9/3
y=3
koordinat(4,3)