Ajuda matemática inequaçao!!!!?

caitlin-kennedy_60acc5670af5d

a)x-2>10

b3+2>-7

c)5x+1>3x-15

d)2y-12>5y+3

e)9x-8>=7x+4

f)10-5x<=-20

g)4x+1>5x-13

h)2.(3x-4)>3(x-11)

i)3.(x-2)-(x+1)<=1.(3x+5)

j)7x-2(x+1)<10-3(x-2)

k)3(x+2)>2(2x+4)

l)x+5(x-1)<=4+3(x+7)

piskuita

http://www.mathway.com/ muito util resolve tudo

-gt-julia-lt-

a)x-2>10

x > 10 + 2

x > 12

b)3+2>-7

se for 3x

3x > -7 - 2

3x > -9

c)5x+1>3x-15

5x - 3x > -15 -1

2x > -16

x > -8

d)2y-12>5y+3

2y - 5y > 3 + 12

-3y > 15

-y > 5 (.-1)

y < 5 [muda o sinal, pois multiplicou por -1]

e)9x-8>=7x+4

9x - 7x >= 4 + 8

2x >= 12

x >= 6

f)10-5x<=-20

-5x <= -20-10

-5x <= -30

-x <= -6

x >= 6

g)4x+1>5x-13

4x - 5x > -13 - 1

-x > -14

x < 14

h)2.(3x-4)>3(x-11)

6x - 8 > 3x - 11

6x - 3x > -11 + 8

3x > -3

x > -1

i)3.(x-2)-(x+1)<=1.(3x+5)

3x - 6 - x - 1 <= 3x + 5

3x - x - 3x <= 5 + 1+6

-x <= 12

x >= -12

j)7x-2(x+1)<10-3(x-2)

7x - 2x - 2 < 10 -3x + 6

7x - 2x + 3x < 10 + 6 + 2

8x < 18

x < 6/4

k)3(x+2)>2(2x+4)

3x + 6 > 4x + 8

3x - 4x > 8 - 6

-x > 2

x < 2

l)x+5(x-1)<=4+3(x+7)

x² - x + 5x - 5 <= 4 + 3x + 21

x² - x + 5x - 3x - 5 - 4 - 21 <=0

x² + x - 30 <= 0

(x + 6)(x -5) <=0

x <= 6

x <= 5