Question

Resolva as equações abaixo:
1- a) x+ 30 = 40 b) 2x + 80 = 120
c) 4x – 50 = 30 d) 6x – 8 = 4
2) 3x – 10 + 7 = -2X + 28
3) 2x + 4x = -2x + 16 + 8
4) 3x + 2x – 30 = - 5x + 100 +20
5) 4x - 2x + 15 = - 3x + 5 + 25 ​

Answer 1

Resposta:

Explicação passo-a-passo:

1- a) x+ 30 = 40

X = 40 - 30

X = 10

b) 2x + 80 = 120

2x = 120 -80 = 40

x=40/2 = 20

c) 4x – 50 = 30

4x = 30 + 50 = 80

x =80/4=20

d) 6x – 8 = 4

6x=4+8=12

x=12/6=2

2) 3x – 10 + 7 = -2X + 28

3x+2x=28+10-7

5x=31

x=31/5=6,2

3) 2x + 4x = -2x + 16 + 8

2x+4x+2x=16+8

8x=24

x=24/8=3

4) 3x + 2x – 30 = - 5x + 100 +20

3x+2x+5x=100+20+30

10x=150

x=150/10=15

5) 4x - 2x + 15 = - 3x + 5 + 25

4x+3x-2x=5+25-15

5x=15

x=15/5=3