Question

Me ajudem
a) 9x - 2 = 4x + 18
b) 7y - 10 = y + 50
c) 2x - 10 + 7x + 10 = 180

Answer 1

Resposta:

A) 4

B) 10

C) 20

Explicação passo a passo:

a) 9x - 2 = 4x + 18

9x - 4x = 18 + 2

5x = 20

x = 20/5

x = 4

b) 7y - 10 = y + 50

7y - y = 50 + 10

6y = 60

y = 60/6

y = 10

c) 2x - 10 + 7x + 10 = 180

2x + 7x = 180 + 10 - 10

9x = 180

x = 180/9

x = 20

Answer 2

$\textsf{Leia abaixo}$

Explicação passo-a-passo:

a)

$\large\boxed{\begin{array}{l} \sf \: 9x - 2 = 4x + 18 \\ \\ \sf \: 9x - 4x = 18 + 2 \\ \\ \sf \: 5x = 20 \\ \\ \sf \: x = \dfrac{20}{5} \\ \\ \sf \: x = 4\end{array}}$

b)

$\large\boxed{\begin{array}{l} \sf \: 7y - 10 = y + 50 \\ \\ \sf \: 7y - y = 50 + 10 \\ \\ \sf \: 6y = 60 \\ \\ \sf \: y = \dfrac{60}{6} \\ \\ \sf \: y = 10\end{array}}$

c)

$\large\boxed{\begin{array}{l} \sf \: 2x - 10 + 7x + 10 = 180 \\ \\ \sf \: 9 x = 180 + 10 - 10 \\ \\ \sf \: 9x = 180 \\ \\ \sf \: x = \dfrac{180}{9} \\ \\ \sf \: x = 20 \end{array}}$