Question

Resolva as equações abaixo a) 4x-5=11 b)5x+7=37-2x c)3(x+2)=21 d)7.(x-2)+9.(3-x)=-13

Answer 1

Resposta:

a) 4x-5=11

4x=11+5

4x=16

x=16/4

x=4

b)5x+7=37-2x

5x+2x=37-7

7x=30

x=30/7

c)3(x+2)=21

3x+6=21

3x=21-6

3x=15

x=15/3

x=5

d)7.(x-2)+9.(3-x)=-13

7x-14+27-9x=-13

7x-9x=-13+14-27

-2x=1-27

-2x=-26 (-1) para mudar o sinal

2x=26

x=26/2

x=13