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Koef. y × y₁ = -2 × 5 = -10
x - 2y = ( 2 - 10 )
x - 2y = -8
x₁= 2 y₁= 5
x - 2y= 0
-2y= -x
y= -1/-2
y= 1/2 atau m₁= 1/2
Karena sejajar, maka :
m₁ = m₂= 1/2
y - y₁= m₂(x - x₁)
y - 5= 1/2(x - 2)
y - 5= 1/2x - 1
2y - 10= x - 2
2y= x - 2 + 10
2y= x + 8
atau
x - 2y + 8= 0