Question

resolva as equações abaixo:
A)x+9=21 B)2X=-9 C)X-1=9 D)4X-10=3 E)X+10=6

Answer 1

a) x + 9 = 21
x = 21 - 9
x = 12

S = {12}

b) 2x = -9
    x = - 9/2

S = {-9/2}

c) x - 1 = 9
    x = 9 + 1
    x = 10
 
S = {10}

d) 4x - 10 = 3
    4x = 3 + 10
    4x = 13
    x = 13/4

S = {13/4}

e) x + 10 = 6
     x = 6 - 10
    x = - 4
   
  S = {- 4}

Answer 2

A) X= 21-9= 12
B) X= -9/2
C) X= 9+1= 10
D) 4X= 3+10; 4X=13 ; X= 13/4
E) X= 6-10= -4