Question

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Answer 1

Resposta:

a) x+9=18

x=18-9

x=9

b) 3y-8=13

3y=13+8

3y=21

y=21/3

y=7

c)x-1=-8

x=-8+1

x=-7

d)8x - 9 = 2x + 11

8x - 2x = 11 + 9

6x = 20

x = 20/6 (simplifica por 2)

x = 10/3

e)7x+5=68-2x

9x=63

x=63/9

x=7

f)12x - 10x - 4 = 3

12x - 10x = 3 + 4

         2x = 7

           x = 7  ou 3,5

                 2