Question

Resolva as equações isolando e calculando o valor de x:

a)x+5=8
b)x-4=3
c)x+9=-1
d)10=x+8
e)15=x+20
f)2x=102
g)3x=15
h)7x=21
i)35x=-105
j)x+101=300
k)2(x-1)-18+16
l)20+6x=26


me ajudem pfv

Answer 1

Explicação passo-a-passo:

a)

x + 5 = 8

x = 8 - 5

x = 3

b)

x - 4 = 3

x = 3 + 4

x = 7

c)

x + 9 = -1

x = -1 - 9

x = -10

d)

10 = x + 8

x = 10 - 8

x = 2

e)

15 = x + 20

x = 15 - 20

x = -5

f)

2x = 102

x = 102/2

x = 51

g)

3x = 15

x = 15/3

x = 5

h)

7x = 21

x = 21/7

x = 3

i)

35x = -105

x = -105/35

x = -3

j)

x + 101 = 300

x = 300 - 101

x = 199

k)

2.(x - 1) - 18 = 16

2x - 2 - 18 = 16

2x - 20 = 16

2x = 16 + 20

2x = 36

x = 36/2

x = 18

l)

20 + 6x = 26

6x = 26 - 20

6x = 6

x = 6/6

x = 1