Question

1- Resolva as equações do 1 grau

a) 2(x+1)= 7+ x
b) 3-(2x-1)= 3 (2x-1)
2(x-1) - 2 (x-2) = -(x-3)

Answer 1

a) 2(x+1)= 7+ x

2x+2=7+x

2x-x=7-2

x=5

b) 3-(2x-1)= 3 (2x-1)

3-2x+1=6x-3

-2x-6x=-3-1-3

-8x=-4-3

-8x=-7

x=-7/-8

x=7/8

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

2x-2-2x+4=-x+3

x+4-2=3

x+2=3

x=3-2

x=1

espero ter ajudado!

boa tarde!

Answer 2

a) 2(x+1)=7+x
2x+2=7+x
2x-x=7-2
x=5

b)3-(2x-1)=3(2x-1)
3-2x+1=6x-3
4-2x=6x-3
4+3=6x+2x
7=8x
7/8=x

c) 2(x-1)-2(x-2)=-(x-3)
2x-2-2x+4=-x+3
2=-x+3
-x=-1 (-1)
x=1