Question

1) Resolva as seguintes equações do primeiro grau com uma incógnita.


a) 4×+2=38
b) 9×=6×+12
c) 5×-1=3×+11
d) 2×+8=×+13
e)23×+2=2
f) 12-7+4×=25
g)5×-3×=30
h)4×+10=45-3×

Answer 1

a) 4x+2=38

4x=38-2

4x=36

x=36/4

x = 9

b) 9x=6x+12

9x-6x=12

3x=12

x=12/3

x=4

c) 5x-1=3x+11

5x-3x=11+1

2x=12

x=12/2

x=6

d) 2x+8=x+13

2x-x=13-8

x=5

e)23x+2=2

23x=2-2

23x=0

x=0/23

x=0

f) 12-7+4x=25

4x=25-12+7

4x=20

x=20/4

x=5

g)5x-3x=30

2x=30

x=30/2

x=15

h)4x+10=45-3x

4x+3x=45-10

7x=35

x=35/7

x=5