Question

1. Resolva as equações

a)5(3-x)-4x=18
b)3,5x+8=-2
c)6(3x+2)-8=-2

Answer 1

a) 15 - 5x - 4x =18
     -9x = 18 - 15
     -9x = 3
        x = 3/-9
        x = - 1/3

b) 3,5x = -2 - 8
    3,5 x = - 10
          x = 3,5/10
          x = 0,35 ou 35/100 = 7/20

Resposta: 0,35 ou 7/20

Answer 2

a) 5.(3 - x) - 4x = 18

15 - 5x - 4x = 18
-5x - 4x = 18 - 15
-9x = 3 . (-1)
x = -3/9
x = -1/3
.
.
.
b) 3,5x + 8 = -2

3,5x = -2 - 8
3,5x = -10
x = 3,5/10
.
.
.
c) 6.(3x + 2) - 8 = - 2

18x + 12 - 8 = -2
18x + 4 = -2
18x = -2 - 4
18x = -6
x = -6/18
x = -1/3