Question

1) Encontre as raízes das equações:
a) 3x – 9 = 9
b) x – 5 = 7
c) y – 6 = 5y + 8
d) 10x = 20 + 9x
e) 2x + 5 – x = 5 – 3x
f) 2m + 6 = m
g) 2x + 1 = 15
h) 5 – x – 20 = 5x – 10 – 7x

Answer 1

Explicação passo-a-passo:

a) 3x – 9 = 9

3x = 9 + 9

3x = 18

x = 18/3

x = 6 (Raiz 6)

b) x – 5 = 7

x = 7 + 5

x = 12 ( Raiz 12)

c) y – 6 = 5y + 8

y - 5y = 8 + 6

- 4y = 14 * ( - 1)

4y = - 14

y = -14/4 ( Raiz 14/4)

d) 10x = 20 + 9x

10x - 9x = 20

x = 20 (Raiz 20)

e) 2x + 5 – x = 5 – 3x

2x - x + 3x = 5 -5

x + 3x = 0

x  = 0/4 ( raiz 0/4)

f) 2m + 6 = m

2m - m = -6

m = -6 (Raiz -6)

g) 2x + 1 = 15

2x = 15 - 1

x = 14/2

x= 7 ( Raiz 7)

h) 5 – x – 20 = 5x – 10 – 7x

-x -5x +7x =  -10 + 20

- 6x + 7x = -10 + 20

x = 10 (Raiz 10)