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-2y= -5x +3 /:(-2)
y= 5/2 x -3/2
k: y= a₁x +b₁ l: y= a₂x +b₂
k _I_ l ⇔ a₁· a₂ = -1⇒ a₂ = -1/a₁
a₁= 5/2 ⇒ a₂ = -2/5
y= -2/5x+b ( -3,2)
2= -2/5·(-3) +b
2= 6/5 +b / -6/5
b= 10/5 -6/5
b= 4/5
y= -2/5x +4/5- postać kierunkowa /·5
5y= -2x +4
2x +5y -4 =0 - postać ogólna