Question

Resolva as equações:
a) x/2 = 8
b) x/2 = -8
c) 3x/4 = 9
d) 2x/3 = -10

Answer 1

a) x = 2.8 = 16
b) x = 2 .-8 = -16
c) 3x = 9.4          3x = 36    x = 36/3     x = 12
d) 2x = -10 . 3      2x = -30       x = -30 /2       x = -15        ok

Answer 2

a)

x  = 8
---
2

x = 2.8
x = 16
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b)
x      =   - 8
---
2

x = 2.(-8)
x = - 16
----------------------------------------------
c)

3x     =   9
----
 4

3x = 4.9
3x = 36
x = 36/3
x = 12
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d)

2x    =  - 10
----
 3

2x = 3.(-10)
2x = - 30
x = - 30/2
x = - 15