Question

4)Resolva as equações:
a)3x -1 = 4
5

b)4x + 3 = -1
5

c)-2(X + 1) = 13-15X

d)10x + 3 = 2x – 15

Answer 1

a) 3x -1 = 4

   3x = 4 + 1

   3x = 5

    x = $\frac{5}{3}$

b) 4x + 3 = -1

   4x = - 1 - 3

   4x = - 4

   x = $\frac{-4}{4}$

   x = - 1

c) -2(x + 1) = 13 - 15x

   - 2x - 2 = 13 - 15x

   - 2x + 15x = 13 + 2

   13x = 15

   x = $\frac{15}{13}$

d) 10x + 3 = 2x – 15

   10x - 2x = - 15 - 3

   8x = - 18

   x = $\frac{-18}{8}$

   x = $-\frac{9}{4}$