Question

29 + 13b + 5b = 11
9y – 25 + y = 32 + 3y – 1
x + x + x + 30 = 2x + 3x + 4x
7a + 35 – 2a – 19 = 5a + 26 – 4a + 20 – 6a
urgente pra hoje

Answer 1

Resposta:

x = 7 – 2y x = 7 – 4 x = 3. 5 · (7 – 2y) – y = 13. 35 – 10y – y = 13. –11y = –22 y = 2. S = {(3, 2)} b) x + 7y = –1. 2x + 3y = 20 x = –1 – 7y.