Question

Rozwiąż równania (zapisz i sprawdzenia)

3x-5=4+2x

-5x+10=-2x-8

-5x-17=-9x+3

7x+14=5x-22

2x-4+5x=x+2

7x+2=5+3x+9

-5x+12+x=2x-12

Proszę o pomoc. wgl tego nie rozumiem xd

Answer 1

3x-5=4+2x

3x-2x = 4+5

x = 9

3*9 - 2*9 = 9

27-18 = 9

9 = 9

 

-5x+10=-2x-8

-5x+2x = -8 -10

-3x = -18

3x = 18

x = 18/3 = 6

(-5)*6 + 2*6 = -8-10

-30+12 = -18

-18 = -18

18=18

 

-5x-17=-9x+3

-5x+9x = 3 + 17

4x = 20

x = 20/4  = 5

(-5) * 5 + 9 * 5 = 20

-25+45 = 20

20 = 20

 

7x+14=5x-22

7x-5x = -22 - 14

2x = -36

x = -36/2 = -18

7*(-18) - 5 * (-18) = -36

-126-(-90) = -36

-126 + 90 = -36

-36 = -36

36=36

 

2x-4+5x=x+2

2x+5x-x = 2+4

6x  = 6

x = 6/6 = 1

2*1+5*1-1=6

2+5-1=6

7-1=6

6=6

 

7x+2=5+3x+9

7x -3x = 5+9-2

4x = 12

x = 12/4 = 3

7*3-3*3=12

21-9=12

12=12

 

-5x+12+x=2x-12

-5x+x-2x = -12 - 12

-6x = -24

6x = 24

x = 24/6 = 4

(-5)*4+4 - 2 * 4=-24

-20 + 4 -8 = -24

-16 - 8 = -24

-24 = -24