Question

1 Determine a raiz da equação:

a) x+4=6

b)3x=15

c)7x=-21

d)x+7=0

e)-4x=2

f)x-8=2

g)2x-7=5x-5

h)8-3x=x+8x

i)x+6>13

j)2x-1<6

Answer 1

Resposta:

Explicação passo-a-passo:

a)x+4=6

x=6-4

x=2

b)3x=15

x=15/3

x=5

c)7x= -21

x= -21/7

x= -3

d)x+7=0

x= -7

e) -4x=2 .(-1)

4x=-2

x= -2/4

x= -1/2

f)x -8=2

x=8+2

x=10

g)2x-7=5x-5

2x-5x=7-5

-3x= 2 .(-1)

3x = -2

x= -2/3

h)8-3x=x+8x

-3x-8x -x= -8

-12x= -8 .(-1)

12x=8

x=8/12

x=2/3

i)x+6>13

x>13-6

x>7

j)2x-1<6

2x<6+1

2x<7

x<7/2

Answer 2

Resposta:

a) ×+4=6

×=6-4

×=2

b) 3×=15

×=15÷3

×=5

c) 7×=-21

×=-21÷7

×=-3

d) ×+7=0

×=0+7

×=7