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g(x) = a₁x + b₁
i warunek prostopadłości prostych
aa₁ = -1
f(x) = (x-5) / 4
f(x) = 1/4x - 5/4 // a=1/4
g(x) = 7 - 4x
g(x) = -4x + 7 // a₁ = -4
1/4 * (-4) = -1
-4/4 = -1
-1 = -1
L=P
Zatem proste są do siebie prostopadłe.