Question

1)resolva as equaçoes a)3x=15 b)2x=14 c) 4x= -12 d)7x = -21 e)13x = 13 f) 9x= -9 g) 25x= 0 h) 35x= -105 i) 4x=1 2)6x=2x+16 b)2x-5=x+1 c)2x+3=x+4 d) 5X+7=4X + 10 E)4X-10=2X+2 F) 4X-7=8X-2 G) 2X+1=4X-7 H) 9X+9+3X=15

Answer 1

a) 3x = 15
x = 15/3
x = 5

b) 2x = 14
x = 14/2
x = 7

c) 4x = -12
x = -12/4
x = -3

d) 7x = -21
x = -21/7
x = -3

e) 13x = 13
x = 13/13
x = 1

f) 9x = -9
x = -9/9
x = -1

g) 25x = 0
x = 0/25
x = 0

h) 35x = -105
x = -105/35
x = -3

i) 4x = 1
x = 1/4

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2) a) 6x = 2x + 16
6x - 2x = 16
4x = 16
x = 16/4
x = 4

b) 2x - 5 = x + 1
2x - x = 1 + 5
x = 6

c) 2x + 3 = x + 4
2x - x = -3 + 4
x = 1

d) 5x + 7 = 4x
5x - 4x = -7
x = -7

e) 4x - 10 = 2x + 2
4x - 10 - 2x = 2
4x - 2x = 2 + 10
2x = 12
x = 12/2
x = 6

f) 4x - 7 = 8x - 2
4x - 8x = -2 + 7
-4x = 5.(-1)
4x = 5
x = -5/4

g) 2x + 1 = 4x - 7
2x - 4x = -7 - 1
-2x = -8
x = -8/ - 2
x = 4

h) 9x + 9 + 3x = 15
9x + 3x = 15 - 9
12x = 6
x = 6/12 (simplificando por 2 fica 3/6 e por 3 fica 1/3)
x = 1/3

Espero ter ajudado!