Ответы на вопрос:
1) y = - 3x 5x + 3y = 12 y = -3 5x + 3*(-3x) = 12 5x - 9x = 12 -4x = 12 x = -3 x = -3 y = -3*3 x = -3 y = -9 2) x - 2y = 5 2x + 3y = -4 x = 5 + 2y 2(5 + 2y) + 3y = -4 10 + 4y + 3y = -4 7y = -4-10 7y = -14 y = -2 y = -2 x = 5 + 2*(-2) y = -2 x = 1 3) 2x + 3y = 16 3x - 2y = 11 2x = 16 - 3y 3x - 2y = 11 x =(16 - 3y)/2 3* (16 - 3y)/2 - 2y = 11 (48 - 9y)/2 - 2y = 11 24 - 4,5y - 2y = 11 -6,5y = 11 - 24 - 6,5y = -13 y = -13 : (-6,5) y = 2 x = (16 - 3*2)/2 x = 10/2 x = 5 x = 5 y = 2
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