Question

1 calcule e Arme o valor de "×" nas oquaçoes do 1° grau: a)9×+3=7+11 b)4×+1=21× c)5×-6=2×+12 d)8×+1=7×+2 e) 10×-1=8×-9 f) 3×-8=×+2 g)11×-1=8×-13​

Answer 1

Resposta:

a) 9x + 3 = 7 + 11

9x = 7 + 11 - 3

9x = 21

x = 21/11

x = 2,3...

b) 4x + 1 = 21x

4x - 21x = -1

17x = -1

c) 5x - 6 = 2x + 12

5x - 2x = 12 + 6

3x = 18

x = 18/3

x = 6

d) 8x + 1 = 7x + 2

8x - 7x = 2 - 1

x = 1

x = 1/1

x = 1

e) 10x - 1 = 8x - 9

10x - 8x = -9 + 1

2x = -8

x = -8/2

x = -4

f) 3x - 8 = x + 2

3x - x = 2 + 8

4x = 10

x = 10/4

x = 2,5

g) 11x - 1 = 8x - 13​

11x - 8x = 1 - 13

3x = 12

x = 12/3

x = 4