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x₁= 2 y₁= -
2y - x + 6= 0
2y= x - 6
y= 1/2 atau m₁= 1/2
Karena tegak lurus, maka :
m₁. m₂= -1
1/2 . m₂= -1
m₂= -1 : 1/2
m₂= -1 . 2
m₂= -2
y - y₁= m₂(x - x₁)
y - (-1)= -2(x - 2)
y + 1= -2x + 4
y= -2x + 4 - 1
y= -2x + 3
atau
2x + y - 3= 0