Question

resolva as equacoes do 1 grau
a)3*(x+2)+5=x+12
b)5(3x-2)=2(6x+3)
c)2(3-y)+7(2-y)=15-4y
d)4x-5=6x+11

Answer 1

A) 3X+6+5=X+12
2X=1
X=1/2

B) 15X-10=12X+6
3X=16
X=16/3

C) 6-2Y+14-7Y=15-4Y
5Y=-5
Y=-1

D) 4X-6X=16
-2X=16
X=-8

Answer 2

a) 3 . (x + 2) + 5 = x + 12
3x + 6 + 5 = x + 12
3x - x = 12 - 6 - 5
2x = 1
x = 1/2


b) 5 . (3x - 2) = 2 . (6x + 3)
15x - 10 = 12x + 6
15x - 12x = 6 + 10
3x = 16
x = 16/3


c) 2 . (3 - y) + 7 . (2 - y) = 15 - 4y
6 - 2y + 14 - 7y = 15 - 4y
- 2y - 7y + 4y = 15 - 6 - 14
- 9y + 4y = 15 - 20
- 5y = - 5
y = - 5/- 5
y = 1

d) 4x - 5 = 6x + 11
4x - 6x = 11 + 5
- 2x = 16
x = 16/- 2
x = - 8