Question

Resolva as equações
a) 2x-8=8. b)9x+5=4x

c) 21x+1=11x+6. d) 17x-1=15x+3

Answer 1

a) 2x - 8 = 8
2x = 8 + 8
2x = 16
x = 16/8
x = 2

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

c) 21x + 1 = 11x + 6
21x - 11x = 6 - 1
10x = 5
x = 5/10
x = 1/2
x = 0,5

d) 17x - 1 = 15x + 3
17x - 15x = 3 + 1
2x = 4
x = 4/2
x = 2