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jika sejajar maka m1 = m2
(1 - (-1) / (4 - (-2) = (y - (-2) / (1 - 2)
2 / 6 = (y+2) / -1
- 2 / 6 = y + 2
y = -2/6 - 2
y = -2/6 - 12/6
y = - 14/6
y = -7/3
2 / 6 = (y+2) / -1
- 2 / 6 = y + 2
y = -2/6 - 2
y = -2/6 - 12/6
y = - 14/6
y = -7/3