Question

A) 5X-10=-125 B)3X-5=31 C)10X+100=-200 D)10X-100=-200 E)4X=8=40 F)-4X-8=-40 G)-4X+8=-40 H)5X-100=125 ME AJUDEM

Answer 1

a)

$5x - 10 = - 125 \\ 5x = - 125 + 10 \\ 5x= - 115 \\ x = \frac{ - 115}{5} \\ x = - 23$

b)

$3x - 5 = 31 \\ 3x = 31 + 5 \\ 3x = 36 \\ x = \frac{36}{3} \\ x = 12$

c)

$10x + 100 = - 200 \\ 10x = - 200 - 100 \\ 10x = - 300 \\ x = \frac{ - 300}{10} \\ x = - 30$

d)

$10x - 100 = - 200 \\ 10x = - 200 + 100 \\ 10x = - 100 \\ x = \frac{ - 100}{10} = \\ x = - 10$

e)

$4x = 8 = 40$
esse item está incorreto, revise na questão, falta sinais

F)-4x-8=-40
-4x= -40+4
-4x = -36
-x= -36÷4
-x= -9 x(-1)
X= 9

g) -4x+8=-40
-4x= -40-8
-4x= -48
-x= -48÷4
-x= -12 x(-1)
x=12

h) 5x-100=125
5x=125+100
5x= 225
x= 225÷5
x= 45