Question

3)Resolva:

a)5(y-7)=20

b)4(x-3)=2x-5

c)2(3x+3)=6

d)x -2=8
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3

Obrigado pra quem me ajudar!

Answer 1

a) 5(y - 7) = 20

5y - 35 = 20

5y = 20 + 35

5y = 55

y = 55/5

y = 11

b) 4(x - 3) = 2x - 5

4x - 12 = 2x - 5

4x - 2x = - 5 + 12

2x = 7

x = 7/2

c) 2(3x + 3) = 6

6x + 6 = 6

6x = 6 - 6

6x = 0

x = 0/6

x = 0

d) x/3 - 2 = 8

x/3 - 6/3 = 24/3

x - 6 = 24

x = 24 + 6

x = 30

Answer 2

a)

$5 \times (y - 7) = 20 \\ 5y - 35 = 20 \\ 5y = 20 + 35 \\ 5y = 55 \\ y = \frac{55}{5} \\ y = 11$

b)

$4 \times (x - 3) = 2x - 5 \\ 4x - 12 = 2x - 5 \\ 4x - 2x = 12 - 5 \\ 2x = 7 \\ x = \frac{7}{2} \\ x = 3.5$

c)

$2 \times (3x + 3) = 6 \\ 6x + 6 = 6 \\ 6x = 0 \\ x = 0$

d)

$x - 2 = 8 \\ x = 8 + 2 \\ x = 10$

Bons Estudos!!