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m = 3
Maka :
y = mx - ( mx₁ - y₁ )
y = 3x - ( 3 × 2 - 5 )
y = 3x - 1
x₁= 2 y₁= 5
y= 3x - 4
y= 3
Karena sejajar, maka :
m₁ = m₂= 3
y - y₁= m₂(x - x₁)
y - 5= 3(x - 2)
y - 5= 3x - 6
y= 3x - 6 + 5
y= 3x - 1
atau
3x - y - 1= 0