Question

Questão 2: (1,0)Qual o valor de x na equação 2x - 140 = - 4x - 20?
a) 10
b) 20
c) 30
d) 160

Answer 1

Resposta:

x = 20

Explicação passo-a-passo:

2x-140 = -4x-20

2x+4x = -20+140

6x= 120

x = 120/6

x = 20

Answer 2

$\boxed{\begin{array}{l}\sf 2x-140=-4x-20 \ \ \checkmark \end{array}}$

$\boxed{\begin{array}{lr}\Box \ \ 2x-140=-4x-20\\\Box \ \ 2x+4x=-20+140\\\Box \ \ 6x=120\\\Box \ \ x=120/6\\\\\huge\boxed{\sf x=20 \ \checkmark }\end{array}}$

resposta correta;

b)20

prova real;

$\boxed{\begin{array}{lr}2x-140=-4x-20\\40-140=-80-20\\-100=-100\\-100+100=\\\huge\boxed{\sf prova \ real=0 \ \checkmark}\end{array}}$

$\ \ \ \ \heartsuit\\|\underline{\overline{\mathcal{\boldsymbol{\LaTeX}}}}|$