Question

Resolva as seguintes equações de 1° grau:
me ajude

Answer 1

Explicação passo-a-passo:

a)

4x-12=8

4x=8+12

x=20÷4

x=5

b)

7x=-14

x=-14÷7

x=-2

c)

3x-1=8

3x=8+1

x=9÷3

x=3

d)

5x+7=2x+13

5x-2x=13-7

3x=6

x=6÷3

x=2

e)

2x+3=9-x

2x+x=9-3

3x=6

×=6÷3

x=2

f)

4x+11=7x+1

11-1=7x-4x

10=3x

x=10/3

g)

2 (x+1)=9

2x+2=9

2x=9-2

x=7/2

h)

x+1/2=x/6-1/3 multiplica por 6

6*1/2=6 (x/6-1/3)

3 (x+1)=x-2

3x+3=x-2

3x-x=-2-3

2x=-5

x=-5/2

i)

x/4+1=2x+1/2 multiplica por 4

4*(x/4+1)= 4*2x+1/2

x+4=2 (2x+1)

x+4=4x+2

4-2=4x-x

2=3x

x=2/3

j)

2x+1/4-1=x-3/6 multiplica por 12

12 (2x+1/4-1)=12 (x-3/6)

3 (2x+1)-12=2(x-3)

6x+3-12=2x-6

6x-2x=-3+12-6

4x=3

x=3/4