Respostas

2014-02-18T10:48:01-03:00
A) 16+8y=3y+81
8y-3y=81-16
5y=65
y=65/5
y=13

B) 5x=12x+49
5x-12x=49
-7x=49(-1)
7x=-49
x=-49/7
x=-7

C) 5x=12x+49
igual a B

D) -18+2x+6=7x-12-8x
2x+8x-7x=-12+18-6
3x=24
x=8

E) 7x+3-6=5x-5+8
7x-5x=-5+8+6-3
2x=6
x=3

F) 4x-2+18x=6x3-37 (qual o sinal do 3? )
4x+18x-6x=-37-2

G) 8x-9+x-10-4x+5x(cade a igualdade)


 H) 20x+2+x=10x-20
20x+x-10x=-20-2
11x=-22
x=-22/11
x=-2