IDENTIFIQUE O VALOR DE X EM CADA EQUAÇÃO E FAÇA A VERIFICAÇÃO.
Soluções para a tarefa
a) 9x - 5 = 4x + 15 9×4 - 5 = 4×4 + 15
9x - 4x = 15 + 5 36 - 5 = 16 + 15
5x = 20 31 = 31
x = 20/5
x = 4
b) 10x + 18 = 20x - 2 10×2 + 18 = 20×2 - 2
10x - 20x = -2 - 18 20 + 18 = 40 - 2
-10x = - 20 38 = 38
x = -20/-10
x = 2
c) 40 - 8x = x - 14 40 - 8×6 = 6 - 14
-8x - x = -14 - 40 40 - 48 = -8
-9x = -54 -8 = -8
x = -54/-9
x = 6
d)15 - x = 4x - 20 15 - 7 = 4×7 - 20
-x - 4x = -20 - 15 8 = 28 - 20
-5x = -35 8 = 8
x = -35/-5
x = 7
e) 6x + 8 = 10x + 4 6×1 + 8 = 10×1 + 4
6x - 10x = 4 - 8 6 + 8 = 10 + 4
-4x = -4 14 = 14
x = -4/-4
x = 1
Espero ter ajudado.
Resposta:
1- 4
2- 2
3- 6
4- 7
5- 1
Explicação passo-a-passo:
1) 9X - 5 = 4X + 15
--- 9X - 4X = 15 + 5
--- 5X = 20
--- X =
--- X = 4
2) 10X +18 = 20X - 2
--- 18 + 2 = 20X - 10X
--- 20 = 10X
--- = X
--- 2 = X
3) 40 - 8X = X - 14
--- 40 + 14 = X + 8X
--- 54 = 9X
--- = X
--- 6 = X
4) 15 - X = 4X - 20
--- 15 + 20 = 4X + X
--- 35 = 5X
--- = X
--- 7 = X
5) 6X + 8 = 10X + 4
--- 8 - 4 = 10X - 6X
--- 4 = 4X
--- = X
--- 1 = X