Question

POR FAVOR É URGENTE
determine a raiz de cada equação.

a)5 + 3y = –1 + 4y

b)span>–15 – 11x = –9 – 3x

c)2(2x + 3) + 5(x + 1) = 8

d)1 045 – x = 729 – 3x

e)span>–3(4 – x) = 7x – (1 – x)

f)3x + 1 = 2x

g)2(x – 1) + 3(x + 1) = 4(x + 2)

h)5x – 1 = 2 – x

i)5 + x = –7 + 8x

j)2(1 – 5y) + 3(–1 – y) – 4(–7 + 2y) = –y

k)5x – 91 = 4x – 77

l)1 – 3x = 17 – 4x

m)7x + 1 = 3x +2

n)3(x + 3) – 1 = 2

Answer 1

Resposta:

Explicação passo-a-passo:

a)5 + 3y = –1 + 4y =

3Y-4Y=-1-5=

-1Y=-4=Y

Y=-4+1

Y=-3

b)span>–15 – 11x = –9 – 3x

-11X+3X=-9+15

-8X=6

X=6/-8

X=-0,75 OU -3,4

c)2(2x + 3) + 5(x + 1) = 8

4X+6+5X+5=8

9X+11=8

9X=8-11

9X=-3

X=-3/9 DIVIDE TUDO POR 3

X=-1/3

d)1 045 – x = 729 – 3x

1045-729=-3X+X

316=-2X

X=-316/-2

X=-158

e)span>–3(4 – x) = 7x – (1 – x)

-12+3X=7X-(1-X)

-12+3X=8X-1

-12+3X-8X=-1

-12-5X=-1

-5X=-1+12

-5X=11

X=11/-5

X=-11/5 A FRACAO PODE SER ESCRITA ASSIM ESTRAINDO O SINAL NEGATIVO

f)3x + 1 = 2x

3X+1-2X=0

X+1=0

X=-1

g)2(x – 1) + 3(x + 1) = 4(x + 2)

2X-2+3X+3=4(X+2)

5X-2+3=4(X+2)

5X+1=4(X+2)

5X+1=4X+8

5X+1-4X=8

X-1=8

X=8-1

X=7

h)5x – 1 = 2 – x

5X+X=2+1

6X=3

X=3/6 DIVIDE TUDO POR 2

X=1/2

i)5 + x = –7 + 8x

5+X-8X=-7

5-7X=-7

7X=-7-5

7X=-12

X=-12/-7  MULTIPLICA SE TUDO PO -1

X=12/7

j)2(1 – 5y) + 3(–1 – y) – 4(–7 + 2y) = –y

2-10Y+3(-1-Y)-4(-7+2Y)=-Y

2-10Y-3-3Y-4(-7+2Y)=-Y

-1-10Y-3Y-4(-7+2Y)-Y

-1-13Y-4(-7+2Y)=-Y

-1-13Y+28-8Y=-Y

27-21Y=-Y

27-21Y+Y=0

27-20Y=O

-20Y=-27

Y=-27/-20 (X POR -1)

Y= 27/20

k)5x – 91 = 4x – 77

5X-91-4X=-77

X-91=-77

X=-77+91

X=14

l) 1 – 3x = 17 – 4x

1-3x+4x=17

1+x=17

x=17-1

x=16

m) 7x + 1 = 3x +2

7x+1-3x=2

4x+1=2

4x=2-1

4x=1

x=1/4

n) 3(x + 3) – 1 = 2

3x+9-1=2

3x+8=2

3x=2-8

3x=-6

x=-6/3 (x tudo por 3)

x=-2