• Matéria: Matemática
  • Autor: annabolinho93
  • Perguntado 6 anos atrás

a) 2x +3=7
b) 5(b+3)-2=-b+23
c) -x-12=-1
d) 7-9y=4(8-y)​

Respostas

respondido por: vitriaelaine
0

Resposta:

a)2x+3=7

2×=7-3

2×=4

×=4/2

×=2

b)5(b+3)-2=-b+23

5b+15-2=-b+23

5b+b=23-15+2

6b=10

b=10/6÷2

b=5/3

c)-×-12=-1

-×=+12-1

-×=+11 .(-1)

×=-11

d)7-9y=4(8-y)

7-9y=32-y

-9y+y=32-7

-8y=25.(-1)

8y=-25

y=-25/8

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