Question

Determine a raiz das seguintes equações
a)2x-8=16

b)3a+1=19
c) 2x+1=-8
d; 9x+5=4x
e; 20=-6x+32
f; 9x-23=13x-27

Answer 1

a) 2x - 8 = 16
2x = 6 + 8
2x = 14
x = 14/2
x = 7

b) 3a + 1= 19
3a = 19 - 1
3a = 18
a = 18/3
a = 6

c)2x + 1 = -8
2x = -8 -1
2x = - 9
x = - 9/2

d)  9x + 5 = 4x
9x - 4x = -5
5x = -5
x = -5/5
x= -1

e) 20 = - 6x + 32
6x = 32 - 20
6x = 12
x = 12/6
x = 2

f)9x - 23 = 13x - 27
9x - 13x = - 27 + 23
- 4x = - 4  ( - 1 )
4x = 4
x = 4/4
x = 1

g) 7x + 1 - 5x = 9
7x - 5x = 9 - 1
2x = 8
x = 8/2
x = 4