Question

Encontre o valor de x . b) 2×+2=8 c) 10×-4=36 d) 5×-10=25 e) -×+=8 f) -2×=10

Answer 1

B) 2X + 2 = 8
2X= 8-2
2x = 6
x = 6/2
x= 3

C) 10x -4 = 36
10x = 36+4
10x = 40
x = 40/10
x = 4

D) 5x -10 = 25
5x = 25+10
5x = 35
x = 35/5
x = 7

E) -x = 8 
-x = 8 (.-1)
x = -8

F) -2x=10
-2x=10 (.-1)
2x=-10
x=-10/2
x= -5

Bons estudos!
Att.
Rafaela Vieira

Answer 2

b) 2× + 2 = 8 → 2x = 8 - 2 →2x = 6 → x = 6/2 → x = 3

c) 10× - 4 = 36 → 10x = 36 + 4 → 10x = 40 → x = 40/10 → x = 4

d) 5× - 10 = 25 → 5x = 25 + 10 → 5x = 35 → x = 35/5 → x = 7
 
e) -× + = 8 → Se for -x = 8 → 8 = -8
 
f) -2× = 10 → x = 10/-2 → x = -5