Question

determine a solução (raiz) das equações do 1° grau com uma incógnita
a) x-4=0
b) x+4=11
c) 5x=4x+8
d) 2x=8
e) 5x =-30
f) 3x=1
g) 2x+5=13
h) 7x-5=2x
i) 4x-10=3
j) 8x-7=-2x+5
k) 5x+21=10x-19
l) 7x+23-x=2x+20

Answer 1

a) x-4=0
x = 4

b) x+4=11
x = 11 - 4
x = 7

c) 5x=4x+8
5x - 4x = 8
1x = 8

d) 2x=8
x = $\frac{8}{2}$
x = 4

e) 5x =-30
x = $\frac{-30}{5}$
x = - 6
f) 3x=1
x = $\frac{1}{3}$

g) 2x+5=13
2x = 13 - 5
2x = 8
x = $\frac{8}{2}$
x = 2

h) 7x-5=2x
7x - 2x = 5
5x = 5
x = $\frac{5}{5}$
x = 1

i) 4x-10=3
4x = 3 + 10
4x = 13
x = $\frac{13}{4}$

j) 8x-7=-2x+5
8x + 2x = 5 + 7
10x = 12
x = $\frac{12}{10}$
x = $\frac{6}{5}$

k) 5x+21=10x-19
5x - 10x = - 19 - 21
- 5x = - 40
x = $\frac{-40}{-5}$
x = 8

l) 7x+23-x=2x+20
7x - x - 2x = 20 - 23
4x = - 3
x = $\frac{-3}{4}$

Answer 2

A) x-4=0


x=4+0


x=> 0

////\\\\\\/////\\\\\\////////\\\\\\\//////\\\\\///////////\\\\\\///////

B) x+4= 11


x=11-4


x=> 7
//////////////\\\\\\\////////@//////@////////@/\\\\\\\/////////


C) 5x=4x+8


5x-4x=8


1x=8


x=8/1


X=> 8

/////////////\\\\\\////\\\\\\\\////////\\\\\\\\\////////\\\\\\////////\\

D) 2x=8


x=8/2


x=> 4
//////////\\\\\\\//////\\\\\\///////\\\\\\/////\\\\\/////\\\\/////////

E) 5x=-30


x=-30/5


x=> -6

//////////\\\\\\/////@///\\\\\\//////\\\\\/////\\\\\/////\\\//////\\\\


F). 3x=1


x=1/3

////////\\\\\\\/////\\\\\/////\\\\////@////\\\\\\/////@/////\\\\\\


G). 2x+5=13


2x=13-5


2x=8

x=> 8/2


x=4

///////////\\\\\\\\//////@//////\\\\\\\£\\\\//////\\\\\/////\\\\\////

H) 7x-5=2x


7x-2x=5


5x=5


x=> 5/5


x=> (1)

//////\\\\\\//////\\\\\\//////\\\\\\£\\\\\\///////\\\\\\//////\\\\\////

I). 4x-10=3


4x=10+3


4x=13


x=13/4

//////////////////////////\\\\\\//////\\\\\//////\\\\\/////\\\\\////\\\


J) 8x-7=-2x+5


8x+2x=7+5


10x=12


x=>12/10


x=>1.2
///////////////\\\\\\\///////\\\\\\\/////////\\\\\\\/////////\\\\\\///


K). 5x+21=10x-19


5x-10x=-21-19


-5x=-40


x=> -40/-5


x=> (8)

///////////////\\\\\\\\///////\\\\\//\\\\\\//////\\\\\\/////////\\\\\\


L). 7x+23-x=2x+20


7x-x-2x=-23+20


4x=-3


x=-3/4

////////\\\\\\////////\\\\\\00/\\\\\\/////\\\\/////\\\\\\/////\\\///

pronto,bom dia!!