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-4y=-2x-1 /:(-4)
y=1/2x+1/4
a₁=1/2
Aby proste były prostopadle musi być spełniony warunek:
a₂= - 1/a₁
3m-6= - 2
3m= - 2+6
3m=4 /:3
m=4/3