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Karena sejajar maka, m2 = 1/3 juga.
Cara mencari persamaan :
(y-y1) = m(x-x1)
(y-5) = 1/3(x-2)
y-5 = 1/3x-2/3 (lalu sama sama dikali 3 menjadi)
3y-15 = x-2
-x+3y=13