Ответы на вопрос:
1) x = 4 + 5y 4(4 + 5y) - 3y = -1 16 + 20y - 3y = -1 17y = -17 y = -1; x = 4 - 5 = -1 2) x = 3y - 5 2(3y - 5) - 5y = -7 6y - 10 - 5y = -7 y = 3; x = 9 - 5 = 4 3) y = 2 - 2x 3x - 5(2 - 2x) = 16 3x - 10 + 10x = 16 13x = 26 x = 2; y = 2 - 4 = -2 4) y = 3x - 15 2x + 5(3x - 15) = -7 2x + 15x - 75 = -7 17x = 68 x = 4; y = 12 - 15 = -3 5) x = 6y - 2 2(6y - 2) - 3y = 5 12y - 4 - 3y = 5 9y = 9 y = 1; x = 6 - 2 = 4 6) x = 5y - 6 5(5y - 6) - 4y = 12 25y - 30 - 4y = 12 21y = 42 y = 2; x = 10 - 6 = 4
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