Question

Resolva as seguintes equações:
a) x + 4 = 15
b) 2x - 5 = x + 10
c) 5x - 3x - 8 = -29 + 9x
d) 4x + 2 = 38
e) 9x = 6x + 12
f) 5x – 1 = 3x + 11
g) 2x + 8 = x + 13​

Answer 1

a) x + 4 = 15

x=15-4

x=11

___________

b) 2x - 5 = x + 10

2x-x=10+5

x=15

______________

c) 5x - 3x - 8 = -29 + 9x

5x-3x-9= -29+8

-7x= -21

x=(-21)÷(-7)

X=3

____________

d) 4x + 2 = 38

4x=38-2

4x=32

x=32÷4

X=8

_______________

e) 9x = 6x + 12

9x-6x=12

3x=12

x=12÷3

X=4

_______________

f) 5x – 1 = 3x + 11

5x-3x=11+1

2x=12

x=12÷2

X=6

_____________

g) 2x + 8 = x + 13

2x-x=13-8

x=5