Question

resolva as equações do 1° grau

b) 12x-10=5x+11


C)7x+5=68-2x


D)14-3x=2x+29


E)8x-9=2x+11


F)10-4×=9-2x


G)2 (7×+2)+12 (×+1)=2


h)-2 (×-3)=18

Answer 1

b) 12x-10=5x+11
12x - 5x = 11 + 10
7x = 21
x = 21/7
x = 3

C)7x+5=68-2x
7x + 2x = 68 - 5
9x = 63
x = 63/9
x = 7

D)14-3x=2x+29
-3x - 2x = 29 - 14
- 5x = 15
x = -15/5
x = - 3

E)8x-9=2x+11
8x - 2x = 11 + 9
6x = 20
x = 20/6 (simplifica por 2)
x = 10/3

F)10-4×=9-2x
-4x +2x = 9-10
- 2x = - 1 .(-1)
x = 1/2 ou 0,5

G)2 (7×+2)+12 (×+1)=2
14x + 4 + 12x + 12 = 2
26x = 2 - 16
26x = -14
x = -14/26 (÷2)
x = -7/13

h)-2 (×-3)=18
-2x + 6 = 18
-2x = 18 - 6
-2x = 12 .(-1)
x = -12/2
x = -6

espero ter ajudado ;)

Answer 2

b)12x-10=5x+11 = 12x-5x=11+10 = 7x=21 = x=21/7 x=3
c)7x+5=68-2x = 7x+2x=68-5 = 9x=63 x= 63/9 x=7x
d)14-3x=2x+29 = -3x-2x=29+14 = -5x=43 x= 43/-5 (-1) x= -43/5 x=-8,6
E)8x-9=2x+11 = 8x-2x=11+9 = 10x=20 x=20/10 x=2
F)10-4x=9 -2x = -4x+2x=9-10 = -2x=-1 (-1) =2x=1 x=1/2
G) 2 (7x+2)+12 (x+1)=2 = 14x+4+12x+12=2 = 14x+12x=2-4 = 26x=-2 = x=-2/26= -1/13
H)-2 (x-3)=18 = -2x+6=18 -2x=18-6 = -2x=12 = x=12/-2 (-1)= -12/2 = x=-6