Question

calcule o valor do X nas seguintes equações ​

Answer 1

Resposta:

a) 3x+5= 8

3x= 8-5

3x= 3

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

x= 1

b) 10x-19= 21

10x= 21+19

10x= 40

x= $\frac{40}{10}$

x= 4

c) 2x-7= -10

2x= -10+7

2x= -3

x= $\frac{ - 3}{2}$

x= -1,5

d) 5x-27= -4x

5x+4x= +27

9x= 27

x= $\frac{27}{9}$

x= 3

e) 9x+5= 4x

9x-4x= 5

5x= 5

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

x= 1

f) 60+13x= 3x

13x-3x= 60

10x= 60

x= $\frac{60}{10}$

x= 6

g) 23x+2= 2

23x= 2-2

23x= 0

x= $\frac{0}{23}$

x= 0

h) 12-7+4x= 25

4x= 25-5

4x= 20

x= $\frac{20}{4}$

x= 5

i) 5x-3x= 30

2x= 30

x= $\frac{30}{2}$

x= 15

j) 4x+10= 45-3x

4x+3x= 45-10

7x= 35

x= $\frac{35}{7}$

x= 5