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k: 4x + 4y +1 = 0
a₁ = 4
l: (m+1)x +2y = 0
a₂ = m+1
a₁=a₂
4=m+1
m=3
Odp. Dla wartości m = 3.
2) l ⊥k jeżeli a₁ * a₂= -1
l:4x-y+1=0
k: m^2x+y=0
4*a₂ = -1 /4
a₂ = -¼
Odp. Dla wartości m = -¼