Question

Resolva as equações do 1o grau: a) 4x=12 b) 2x/5=4 c) 3x-4=2x+8 d) 7x-2=6+5x

Answer 1

Resposta:

$4x = 12 \\ x = \frac{12}{4} = 3 \\ \\ \frac{2x}{5} = 4 \: \: \: \: \: \: \: 2x = 20 \: \: \: \: x = 10$

$3x - 4 = 2x + 8 \\ 3x - 2x = 8 + 4 \\ x = 12 \\ \\ 7x - 2 = 6 + 5x \\ 7x - 5x = 6 + 2 \\ 2x = 8 \\ x = \frac{8}{2} = 4$

Answer 2

A) 4x =12

X= 12/4

X= 3

B) 2x/ 5= 4

2x= 4*5

2x = 20

X= 20/2

X=10

C) 3x -4 = 2x+8

3x - 2x = 8 + 4

X = 12

D) 7x - 2 = 6+5x

7x - 5x = 6+2

2x =8

X= 8/2

X = 4