Question

Resolva as equações, sendo U = Q: a) 2x – 8 = 8 b) 3x + 1 = 19 c) 3x = - 7 + x d) 17x + 40 = 21x

Answer 1

a) 2x-8= 8

2x= 8+8

2x= 16

2x= 8

b) 3x+1= 19

3x= 19-1

3x= 18

x= 6

c) 3x= -7+x

3x-x= -7

2x= -7

x= 7/2

d) 17x+40 =21x

17x-21x = 40

-4x =40 × (-1)

4x = -40

x = -10