Odpowiedź
a) y = 2 - 2x 3x -2(2 - 2x) = 3 y = 2 - 2x 3x - 4 + 4x = 3 y = 2 - 2x 7x = 7 y = 2 - 2x x = 1 y = 2 - 2 x = 1 y = 1 x = 1 b) x = 3 - 3y -2(3 - 3y) + 5y = 5 x = 3 - 3y -6 + 6y + 5y = 5 x = 3 - 3y 11y = 5 + 6 x = 3 - 3y 11y = 11 x = 3 - 3y y = 1 x = 3 - 3 y = 1 x = 0 y = 1 c) 5x + 3y = 2 x = y =2 5(y +2) + 3y = 2 x = y +2 5y + 10 + 3y = 2 x = y + 2 8y = 2 - 10 x = y + 2 8y = -8 x = y + 2 y = -1 x = -1 + 2 y = 1 x = 1
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