Question

Resolva em R as equações a seguir:

a) x + 5 = 12

b) y + 9 = 3

c) 4(x + 3) = 20

d) 5(2x - 1) = 2(x + 4)

e) 7x + 9 -- 2x = 20 + 4x + 1

Answer 1

Resposta:

OLá bom dia!

a) x + 5 = 12

x  = 12 - 5

x = 7

b) y + 9 = 3

x  = 9 - 3

x = 6

c) 4(x + 3) = 20

4x + 12 = 20

4x = 20 - 12

4x = 8

x = 8/4

x = 2

d) 5(2x - 1) = 2(x + 4)

10x - 5 = 2x + 8

10x - 2x = 5 + 8

8x =  13

x = 13/8

e) 7x + 9 -- 2x = 20 + 4x + 1

7x - 2x - 4x  = 20 + 1 - 9

5x - 4x = 21 - 9

x =  12