Question

4) Resolva as equações:
a) 2.(3 - y) + 7.(2 - y) = 15 - 4y
b) 4x - 5 = 6x + 11
c) 2.(x - 2) +5.(2-x) + 6.(x + 1)= 0

Answer 1

Resposta:

a) 2.(3 - y) + 7.(2 - y) = 15 - 4y

6-2y+14-7y=15-4y

-2y-7y+4y=15-6-14

-5y= -5.(-1)

5y = 5

y=5/5

y=1

b) 4x - 5 = 6x + 11

4x-6x=11+5

-2x=16.(-1)

2x=-16

x= -16/2

x= -8

c) 2.(x - 2) +5.(2-x) + 6.(x + 1)= 0

2x-4+10-5x+6x+6=0

2x-5x+6x= 4-10-6

3x= -12

x= -12/3

x= -4

Explicação passo-a-passo: