Question

2x+4 = -8

13-x = x+10

- 2/7 x = 4

4 (3-x) - 8 (x-5) = 4x + 4

15x + 3 (1-2x) = 9x

4x + 3 = - 11

8 - x = x + 12

- 2/3 x = 6

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

6 - 4 (y - 3) = 22

Answer 1

1. 2x+4=8

2x=8-4

2x=4/2

x=2

2. 13-x=x+10

13-10=x+x

3=2x/2

x=2/3

3.-2/7x=4 /(-2/7)

x=-1/14

4. 4(3-x)-8(x-5)=4x+4

12-4x-8x+40=4x+4

52-12x=4x+4

-12x-4x=4-52

-16x=-48/(-16)

x=3

 

5. 15x+3(1-2x)=9x

15x+3-6x=9x

9x+3=9x

9x-9x=3

0=3 <- równanie sprzeczne

 

6. 4x+3=-11

4x=-11-3

4x=-14/4

x=-3,5

 

7. 8-x=x+12

8-12=x+x

-4=2x/2

x=-2

 

8. -2/3x=6 /(-2/3)

x=-1/9

 

9. 2(3-x)-4(x-5)=2x+2

6-2x-4x+20=2x+2

26-6x=2x+2

26-2=2x+6x

24=8x/8

x=3

 

10. 6-4(y-3)=22

6-4y+12=22

-4y=22-6-12

-4y=4/(-4)

y=-1

 

 

 

Answer 2

a)2x+4=8

2x=8-4

2x=4      /2

x=2

 

b)13-x=x+10

-x-x=10-13

-2x=-3    /:(-2)

x=1,5

 

c)4(3-x)-8(x-5)=4x+4

12-4x-8x+40=4x+4

-4x-4x-8x=4-40-12

16x=48  /:16

x=3

 

d)4x+3=-11

4x=-11-3

4x=-14    /:4

x=-3,5

 

e)8-x=x+12

-x-x=12-8

-2x=4    /:(-2)

x=-2

 

f)2(3-x)-4(x-5)=2x+2

6-2x-4x-2x=2x+2

-2x-4x-2x=2-20-6

-8x=-24   /:(-8)

x=3

 

g)6-4(y-3)=22

6-4y+12=22

-4y=22-6-12

-4y=4   /:(-4)

y=-1