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Koef. y × y₁ = -5 × 2 = -10
Persamaan garis yang sejajar :
2x - 5y - ( -10 - 10 ) = 0
2x - 5y + 20 = 0
x₁= -5 y₁= 2
2x - 5y + 1= 0
-5y= -2x - 1
y= -2/-5
y= 2/5 atau m₁= 2/5
Karena sejajar, maka :
m₁ = m₂ = 2/5
y - y₁= m₂(x - x₁)
y - 2= 2/5(x - (-5)
y - 2= 2/5(x + 5)
y - 2= 2/5x + 2
5y - 10= 2x + 10
5y= 2x + 10 + 10
5y= 2x + 20
atau
2x - 5y + 20= 0