Question

Resolva as equações a seguir

A) 2x+8=14
B) 3a-a=a-16
C) 18-3b=9-b
D) 4x-8=3(x-1)
E) -6y+4=2y+10
F) -2(3x-4) = 3x-7
G) 9y-3y =28
H) -6x+2=-2x+10
I) -(12x-9)= 2x -14

Answer 1

A) 2x+8=14
2x=14-8
2x=6
x=6/2
x=3

B)3a-a=a-16
3a-a-a=-16
a=-16

C)18-3b=9-b
-3b+b=9-18
-2b=-9 (multiplica por -1)
2b=9
b=9/2

D)4×-8=3(x-1)
4x-8=3x-3
4x-3x=-3+8
x=5

E)-6y+4=2y+10
-6y-2y=10-4
-8y=6 ( multiplica por- 1)
8y=-6
y=-6/8

F)-2(3x-4)=3x-7
-6x+8=3x-7
-6x-3x=-7-8
-9x=-15 ( multiplica por- 1)
9x=15
x=15/9(divide por 3 )
x= 5/3

G)9y-3y=28
6y=28
y=28/6

H)-6x+2=-2x+10
-6x+2x=10-2
-4x=8 ( multiplica por- 1)
4x=8
x=8/4
x=2

I)-(12x-9)=2x-14
-12x+9=2x-14
-12x-2x=-14-9
-14x=-23(multiplica por- 1)
14x=23
x=23/14