Question

1) resolva as equações do 1º grau:

a) x + 5 = 15    
b) x + 3 = 7  
c) x – 4 = – 12    
d) 2x – 12 = 18 + x    
e) 3x = 15
f) 4x = – 24
g) 9x = 9   
h) 13x + 15 = 45 + 3x  
i) 3x = – 21  
j) 4x – 15 = 30 – x 
k)  16 x –1 = 12x + 3

​

Answer 1

Explicação passo-a-passo:

a)

x + 5 = 15

x = 15 - 5

x = 10

b)

x + 3 = 7

x = 7 - 3

x = 4

c)

x - 4 = -12

x = -12 + 4

x = -8

d)

2x – 12 = 18 + x    

2x - x = 18 + 12

x = 30

e)

3x = 15

x = 15/3

x = 5

f)

4x = – 24

x = -24/4

x = -6

g)

9x = 9 

x = 9/9

x = 1

h)

13x + 15 = 45 + 3x  

13x - 3x = 45 - 15

10x = 30

x = 30/10

x = 3

i)

3x = – 21  

x = -21/3

x = -7

j)

4x – 15 = 30 – x 

4x + x = 30 + 15

5x = 45

x = 45/5

x = 9

k)

16x –1 = 12x + 3

16x - 12x = 3 + 1

4x = 4

x = 4/4

x = 1

Bom estudo.

Answer 2

a) x + 5 = 15

x = 15 - 5

x = 10

b) x + 3 = 7

x = 7 - 3

x = 4

c) x - 4 = -12

x = -12 + 4

x = -8

d) 2x - 12 = 18 + x

2 x - x = 18 + 12

x = 30

e) 3x = 15

x = 15/3

x = 5

f) 4x = -24

x = - 24/4

x = -6

g) 9x = 9

x = 9/9

x = 1

h) 13x + 15 = 45 + 3x

13x - 3x = 45 - 15

10x = 30

x = 30/10

x = 3

i) 3x = -21

x = - 21/3

x = -7

j) 4x - 15 = 30 - x

4x + x = 30 + 15

5x = 45

x = 45/5

x = 9

k) 16x - 1 = 12x + 3

16x - 12x = 3 + 1

4x = 4

x = 4/4

x = 1