Question

a) 9x – 2 = 4x + 18 = 9x – 4x = 18 + 2 = 5x = 20 = x = 20/5= x = 4
b) 5 (2x – 1 ) = 3 (x + 10) = 10x -5 = 3x +30 = 10x – 3x = 30 + 5 = 7x = 35 = x = 35/7 = x =5
c) 7y – 10 = y + 50
d) 4x – 18 + 3x = 10
e) 5x – 91 = 4x – 77
f) 7x + 1 = 5x – 7
g) 4x + 5 = x + 20
h) 2(x + 5 ) – 4 = 26
i) 3(x + 3 ) – 5 = 22
j) 3( x + 2 ) = 2 ( x – 7)
l) 4(2x –1 ) = 3( x+2 )
k) 3(x + 3 ) - 1 = 2
m) 3(2x – 3 ) + x = 5
pfvr

Answer 1

Resposta:

c) 10

d) 4

e) 14

f) – 4

g) 5

h) 10

i) 6

j) – 20

l) 2

k) - 2

m) – 4/7

Explicação passo a passo:

c) 7y – 10 = y + 50

7y –y = 50 + 10

6y = 60

y = 60/6

y = 10

d) 4x – 18 + 3x = 10

4x + 3x = 10 + 18

7x = 28

x = 28/7

x = 4

e) 5x – 91 = 4x – 77

5x – 4x = 91 – 77

x = 14

f) 7x + 1 = 5x – 7

7x - 5x = – 7 – 1

2x = – 8

x = – 8/2

x = – 4

g) 4x + 5 = x + 20

4x – x = 20 – 5

3x = 15

x = 15/3

x = 5

h) 2(x + 5 ) – 4 = 26

2x + 10 – 4 = 26

2x + 6 = 26

2x = 26 – 6

2x = 20

x = 20/2

x = 10

i) 3(x + 3 ) – 5 = 22

3x + 9 – 5 = 22

3x + 4 = 22

3x = 22 – 4

3x = 18

x = 18/3

x = 6

j) 3( x + 2 ) = 2 ( x – 7)

3x + 6 = 2x – 14

3x – 2x = – 14 – 6

x = – 20

l) 4(2x –1 ) = 3( x+2 )

8x – 4 = 3x + 6

8x – 3x = 6 + 4

5x = 10

x = 10/5

x = 2

k) 3(x + 3 ) - 1 = 2

3x + 9 - 1 = 2

3x + 8 = 2

3x + 8 - 2 = 0

3x + 6 = 0

3x = - 6

x = - 6/3

x = - 2

m) 3(2x – 3 ) + x = 5

6x – 9 + x = 5

6x + x = 5 – 9

7x = – 4

x = – 4/7