Question

a)x-3=9
b)4x-9=1-2x
c)x+5=20-4x
d)9x-4x+10=7X -30​

Answer 1

Resposta:

A) X - 3 = 9
X = 9 + 3
X = 12

B) 4x - 9 = 1 - 2x
4x + 2x = + 9 + 1
6x = 10
x = 10 / 6
x = 5 / 3

C) x + 5 = 20 - 4x
X + 4x = 20 - 5
5x = 15
X = 15 / 5
X = 3

D) 9x - 4x + 10 = 7x - 30
9x - 4x - 7x = - 10 - 30
- 2x = - 40
X = - 40 / - 2
X = 20

Avalia por favor.

Answer 2

Explicação passo-a-passo:

a)

$x - 3 = 9$

$x = 9 + 3$

$x = 12$

b)

$4x - 9 = 1 - 2x$

$4x + 2x - 9 = 1$

$4x + 2x = 1 + 9$

$6x = 1 + 9$

$6x = 10$

$x = \frac{5}{ 3}$

c)

$x + 5 = 20 - 4x$

$x + 4x + 5 = 20$

$x + 4x = 20 - 5$

$5x = 20 - 5$

$5x = 15$

$x = 3$

d)

$9x - 4x + 10 = 7x - 30$

$5x + 10 = 7x - 30$

$5x - 7x + 10 = - 30$

$5x - 7x = - 30 - 10$

$- 2x = - 30 - 10$

$- 2x = - 40$

$x = 20$

( ͡° ͜ʖ ͡°)