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1a. -7x - 14 + 4 = -3x -4x = 10 x = -2.5 b. 6x = 10 x = 1 i 2/3 c. (x-1)(x+1) = x(x+3) x2 - 1 = x2 + 3x 3x = -1 x = -1/3 e. 2x + 4 + 6x + 12 = 0 8x = -16 x = -2 f. x2 - x = x2 + 3 -x = 3 x = -3 g. 4x - 8 / 12 - 3x-9 / 12 = x-1 x-17 / 12 = 12x - 12 - 11x = 5 x = -5/11 2a. -8x - 4 >/ (wieksze badz rowne) -x - 1 -7x >/ 3 x b. x2 + 4x + 4 - x2 + 4x - 4 < 0 8x < 0 x < 0 x€ ( - niesk. ; 0) c. 3x > 6 x > 2 x€ (2; +niesk) d. 4x - 1 > 3x x > 1 x € (1; +niesk) e. x € {1,2} f. x € {0, 10} 3a. x=5-y 5-y-2y=1 x=5-y -3y = -4 x=5-y y = 1 i 1/3 x = 3 i 2/3 y = 1 i 1/3 b. x-y = 4 | x3 3x-3y = 24 3x - 3y = 12 3x - 3y = 24 + 6x = 36 x = 6 6 - y = 4 y = 2 c. 2x - y + 2 = 2x 2x = -y y = -2 x = -1 4. x - 1sze naczynie y - 2gie naczynie x+y = 24 x - 3 = y + 3 x+y = 24 x = y + 6 2y = 18 x = y+6 y+9 x+15