Question

1)Resolva as equações do primeiro grau.

[A]2X-6=-X+15

[B]2(X-3)-4X=-3X-8

[C]8X-(X+3)=11

[D]100X+80=120X-(40X)

Answer 1

a)

2x-6=-x+15

2x+x=15+6

3x=21

x=21/3

x=7

b)

2(x-3)-4x=-3x-8

2x-6-4x=-3x-8

2x+3x-4x=-8+6

x=-2

c)

8x-(x+3)=11

8x-x-3=11

8x-x=11+3

7x=14

x=14/7

x=2

d)

100x+80=120x-(40x)

100x+80=120x-40x

80=120x-40x-100x

80=120x-140x

80=-20x

x=80/-20

x=-4

Answer 2

Resposta:

Explicação passo-a-passo:

a)

2x-6=-x+15

2x+x=15+6

3x=21

x=21/3

x=7

b)

2(x-3)-4x=-3x-8

2x-6-4x=-3x-8

2x-4x+3x=-8+6

x=-2

c)

8x-(x+3)=11

8x-x-3=11

7x=11+3

7x=14

x=14/7

x=2

d)

100x+80=120x-(40x)

100x+80=120x-40x

100x+40x-120x=-80

20x=-80

x=-80/20

x=-4

Espero ter lhe ajudado!