Роздiл 5. Лiнiйнi рiвняння та ix системи » 789 (3-4)

3) (3y-4)/3 = (4y-3)/2 – (5-2y)/3| • 6; 2(3y – 4) = 3(4y – 3) – 2(5 – 2y); 6y – 8 = 12y – 9 – 10 + 4y; 6y – 12y – 4y = –9 – 10 + 8; –10y = –11; y = 1,1. 4) (x – 4)2 – (x + 4)2 = 16; (x – 4 – (x + 4))(x – 4 + x + 4) = 16; (x – 4 – x – 4) • 2x = 16; –8 • 2x = 16; –16x = 16; x = –1.