Question

1.Resolva as equações do 1° grau com uma incógnita:
a) 9x + 7 = 32 + 4x b) 2. ( x – 3 ) = 12 c) 21x – 17 = 109
d) 5. ( x + 2 ) – 3 ( x + 6 ) = 40 e) 4x + 2. ( 14 – x ) = 48

Answer 1

a)

9x + 7= 32 + 4x

9x - 4x= 32 - 7

5x= 25

x= 25/5

x= 5

b)

2(x - 3)= 12

2x - 6= 12

2x= 12 + 6

2x= 18

x= 18/2

x= 9

c)

21x - 17= 109

21x= 109 + 17

21x= 126

x= 126/21

d)

5(x + 2) - 3(x + 6)= 40

5x + 10 - 3x - 18= 40

5x - 3x= 40 - 10 + 18

2x= 48

x= 48/2

x= 24

e)

4x + 2(14 - x)= 48

4x + 28 - 2x= 48

4x - 2x= 48 - 28

2x= 20

x= 20/2

x= 10