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Знайти координати вектора AB, якщо A(1; 4), B(3; 1).
Розв'язок: AB = {3 - 1; 1 - 4} = {2; -3}.
Приклад 2. Знайти координати точки B вектора AB = {5; 1}, якщо координати точки A(3; -4).
Розв'язок:
ABx = Bx - Ax => Bx = ABx + Ax => Bx = 5 + 3 = 8
ABy = By - Ay => By = ABy + Ay => By = 1 + (-4) = -3
Відповідь: B(8; -3).
Приклад 3. Знайти координати точки A вектора AB = {5; 1}, якщо координати точки B(3; -4).
Розв'язок:
ABx = Bx - Ax => Ax = Bx - ABx => Ax = 3 - 5 = -2
ABy = By - Ay => Ay = By - ABy => Ay = -4 - 1 = -5
Відповідь: A(-2; -5).
