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x₁= 1 y₁= -2
y - 2x = -1
y= 2x - 1
y= 2 atau m₁= 2
Karena sejajar , maka :
m₁ = m₂
2 = 2
y - y₁= m₂(x - x₁)
y - (-2)= 2(x - 1)
y + 2= 2x - 2
y= 2x - 2 - 2
y= 2x - 4
atau
2x - y - 4= 0