Question

resolva

a) 8x+3=-5

b) 2x+10=+20

c) 3x-10=x+20

d) 4x-15=2x9

me ajudem serio, e pra provaaa​

Answer 1

Resposta:

Oi Bom dia!

a) 8x+3=-5

8x = -5 - 3

8x = -8

x = -8:8

x = -1

b) 2x+10=+20

2x = 20 - 10

2x = 10

x = 10:2

x = 5

c) 3x-10=x+20

3x - x = 20 + 10

2x = 30

x = 30:2

x = 15

d) 4x-15=2x9 (?)

4x - 15 = 18

4x = 18+15

4x = 33

x = 33/4

ou

4x -15 = 2x + 9

4x - 2x = 15 + 9

2x = 24

x = 24:2

x = 12

ou

4x - 15 = 2x - 9

4x - 2x = 15 - 9

2x = 6

x = 6:2

x = 3