Question

2. Resolva as equações:
a) x + 5 = 8
b) x + 9 = − 1
c) 7 = x + 8

d) 5x − 91 = 4x − 77
e) 2x + 18 = 36
f) 7(x + 1) = 2(x + 1)

Answer 1

a) x + 5 = 8

x = 8 - 5

x = 3

b) x + 9 = − 1

x = -1 - 9

x = -10

c) 7 = x + 8

7 - 8 = x

x = -1

d) 5x − 91 = 4x − 77

5x - 4x = -77 + 91

x = 14

e) 2x + 18 = 36

2x = 36 - 18

2x = 18

x = 18/2

x = 9

f) 7(x + 1) = 2(x + 1)

7x + 7 = 2x + 2

7x - 2x = 2 - 7

5x = -5

x = -5/5

x = -1