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C(1, 2), D(x, y)
AB = [-1-4; -2-(-2)] = [-5; 0]
CD = [x-1; y-2]
Te wektory są równe, zatem:
x - 1 = -5
y - 2 = 0
x = -4
y = 2
D (-4, 2)
. zgadlem?