Question

URGENTE Ganhe Pontos:

resolva as equaçoes de Primeiro Grau:

 

a)3x-2=x-10

b)x-6=3x+21

c)4x-7=2x-31

d)5x+10=x+23

e)5x-21=8x-41

f)2(x-3)=5(x-7)

g)4(2x+8=3(3x-6)

Answer 1

a)3x-2=x-10b)x-6=3x+21c)4x-7=2x-31d)5x+10=x+23e)5x-21=8x-41f)2(x-3)=5(x-7)g)4(2x+8=3(3x-6)

a) 3x-2=x-10
    3x-x=-10+2
    2x=-8
    x=-8/2=-4

b) x-6=3x+21
    3x-x=-6-21
    2x=-27
    x=-27/2

c) 4x-7=2x-31
    4x-2x=-31+7
    2x=-24
     x=-24/2 = -12

d) 5x+10=x+23
    5x-x=23-10
    4x=13
     x=13/4

e) 5x-21=8x-41
    8x-5x=-21+41
    3x=20
x=20/3

f) 2(x-3)=5(x-7)
   2x-6=5x-35
   5x-2x=-6+35
   3x=29
    x=29/3

g) 4(2x+8=3(3x-6)
    8x+32=9x-18
    9x-8x=32+18
    x=50

Answer 2

a)3x-2=x-10
3x - x = - 10 + 2
2x = - 8
x = - 8/2
x = - 4

b)x-6=3x+21
x - 3x = 21 + 6
- 2x = 27(-1)
2x = - 27
x = -27/2

c)4x-7=2x-31
4x - 2x = - 31 + 7
2x = - 24
x = - 24/2
x = - 12

d)5x+10=x+23
5x - x = 23 - 10
4x = 13
x = 13/4

e)5x-21=8x-41
5x - 8x = - 41 + 21
- 3x = - 20 (-1)
3x = 20
x = 20/3

f)2(x-3)=5(x-7)
2x - 6 = 5x - 35
2x - 5x = - 35 + 6
- 3x = - 29 (-1)
3x = 29
x = 29/3

g)4(2x+8)=3(3x-6)
8x + 32 = 9x - 18
8x - 9x = - 18 - 32
- x = - 50 (-1)
x = 50