Question

13) x = y - 2
2x +y = -1

Answer 1

RESPOSTA:

▊ x = -1
▊ y = 1



▣ x = y - 2
▣ 2x + y = -1

▣ 2 . (y - 2) + y = -1
▣ 2y - 4 + y = -1
▣ 2y + y = -1 + 4
▣ 3y = 3
▣ y = 3/3
▣ y = 1

▣ 2x + 1 = -1
▣ 2x = -1 - 1
▣ 2x = -2
▣ x = -1