Question

Resolva as equações do 1° grau:
a) x + 4 = 19

b) x – 7 = 13

c) x - 6 = 13

d) x + 1 = - 9

e) 5x – 6 = 34

f) 8x + 3 = 27

g) 4x – 4 = 44

h) 6x + 3 = x + 38

i) 6x - 4 = 3x + 20

j) 7x + 12 = 3x – 20

Answer 1

a)

x + 4= 19

x= 19 - 4

x= 15

b)

x - 7= 13

x= 13 + 7

x= 20

c)

x - 6= 34

x= 34 + 6

x= 40

d)

x + 1= - 9

x= - 9 - 1

x= - 10

e)

5x - 6= 34

5x= 34 + 6

5x= 40

x= 40/5

x= 8

f)

8x + 3= 27

8x= 27 - 3

8x= 24

x= 24/8

x= 3

g)

4x - 4= 44

4x= 44 + 4

4x= 48

x= 48/4

x= 12

h)

6x + 3= x + 38

6x - x= 38 - 3

5x= 35

x= 35/5

x= 7

i)

6x - 4= 3x + 20

6x - 3x= 20 + 4

3x= 24

x= 24/3

x= 8

j)

7x + 12= 3x - 20

7x - 3x= - 20 - 12

4x= - 32

x= - 32/4

x= - 8

Answer 2

Explicação:

$a) x + 4 = 19$

$x = 19 - 4$

$x = 15$

$b) x- 7 = 13$

$x = 13 + 7$

$x = 20$

$c) x - 6 = 13$

$x = 13 + 6$

$x = 19$

$d) x + 1 = - 9$

$x = -9 - 1$

$x = -10$

$e) 5x - 6 = 34$

$5x = 34 + 6$

$5x = 40$

$x = \frac{40}{5}$

$x = 8$

$f) 8x + 3 = 27$

$8x = 27 -3$

$8x = 24$

$x = \frac{24}{8}$

$x = 3$

$g) 4x - 4 = 44$

$4x = 44 + 4$

$4x = 48$

$x = \frac{48}{4}$

$x = 12$

$h) 6x + 3 = x + 38$

$6x -x = 38 - 3$

$5x = 35$

$x = \frac{35}{5}$

$x = 7$

$i) 6x - 4 = 3x + 20$

$6x - 3x = 20 + 4$

$3x = 24$

$x = \frac{24}{3}$

$x = 8$

$j) 7x + 12 = 3x - 20$

$7x - 3x = -20 - 12$

$4x = -32$

$x = \frac{-32}{4}$

$x = -8$