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⇒ y - b = m(x - a)
⇒ y - 1 = 1/2(x - 1)
⇒ y - 1 = 1/2·x - 1/2
⇒ y = 1/2·x + 1/2
⇒ 2y = x + 1
⇒ x - 2y + 1 = 0
jadi persamaan garisnya adalah x - 2y + 1 = 0
y-1 = 1/2 (x -1)
y-1= 1/2x - 1/2
y= 1/2x -1/2 +1
y = 1/2x - 1/2