Question

3. EQUAÇÕES DO 1 GRAU .
a) 3X – 2(4X – 3) = 2 – 3(X – 1)
b) 3(X – 1) – (X – 3) + 5(X – 2) = 18
c) 5(X – 3) – 4(X + 2) = 2 + 3(1 – 2X)

Answer 1

Resposta:

Explicação passo a passo:

a) 3X – 2(4X – 3) = 2 – 3(X – 1)      

  3x  - 8X + 6= 2- 3x + 3

 3x - 8x + 3x = 2 + 3 - 6

- 2x = - 1  (×-1)

2x = 1

x =1/2

x = 0.5

b) 3(X – 1) – (X – 3) + 5(X – 2) = 18

   3x ₋ 3 - x + 3 + 5x - 10 = 18

  3x - x + 5x = 18 + 3 - 3 + 10

 7x = 28

 x= 28/7

 x= 4

c) 5(X – 3) – 4(X + 2) = 2 + 3(1 – 2X)

  5x - 15 - 4x - 8 = 2 + 3 - 6x

  5x - 4x + 6x = 2 + 3 + 15 + 8

 7x = 28

 x = 28/7

 x = 4