Question

por favorr!!!!!!!!!!!​

Answer 1

Resposta:

1)

a) x = 16

b) x = -7

c) x = -2

d) x = 6

e) x = 9

f) -3 = y

g) -18 = x

h) x = 20

i) x= -2

j) x = 12

k) 11/2

l) -11 = x

Explicação:

1)

a)x+5 = 21

x = 21-5

x = 16

b) x+17 = 10

x = 10-17

x = -7

c) x-5 = -7

x = -7+5

x = -2

d) 3x-9 = 9

3x = 9+9

3x = 18

x = 18÷3

x = 6

e) 3x = 45-2x

3x+2x = 45

5x = 45

x = 45÷5

x = 9

f) y-4 = 5y+8

y-4-8 = 5y

-4-8 = 5y-y

-12 = 4y

-12÷4 = y

-3 = y

g) 2x-10 = 8+3x

2x-10-8 = 3x

-10-8 = 3x-2x

-18 = x

h) 10x = 20+9x

10x-9x = 20

x = 20

i) 6×(x+3)-2×(x-5) = 20

6x+18-2x+10 = 20

6x-2x = 20-18-10

4x = 2-10

4x = -8

x = -8÷4

x = -2

j) 2×(x+3) = 30

2x+6 = 30

2x = 30-6

2x = 24

x = 24÷2

x = 12

k) 2×(x-1)-1 = 8

2x-2-1 = 8

2x = 8+2+1

2x = 10+1

2x = 11

x = 11/2

l) -18 = 3x+15

-18-15 = 3x

-33 = 3x

-33÷3 = x

-11 = x