Ответы на вопрос:
1) 2x + y = -7 + 3x - y = -2 5x = -9 x = -9/5 = -1.8 y = -7 - 2x = -7 + 2*1.8 = -3.4 2) y+3x=11+ 2x-y=9 5x = 20 x = 4 y = 11 - x = 11 - 3*4 = 11 - 12 = -1 3) x+y=3 2x-3y=-4x = 3 - y 2(3 - y) - 3y = -4 6 - 2y - 3y = -4 -5y = -10 y = 2 x = 3 - 2 = 1 4) 7x-15y=129|*3 -3x-11y=-3|*721x - 45y = 387 + -21x - 77y = -21 -122y = 366 y = -3 x = (-3 + 11y)/-3 = (-3 + 33)/-3 = 30/-3 = -10
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