Question

A) 3*(x-6)=18 b) jedna druga y+6=y-4 c)2*(x+3)+5*(x+2)=2 d)6*(x-2)=5+4(x+3) e)2*(x-4)-3(x-3)=4

Obliczzz

Answer 1

a) 

3*(x-6)=18

3x-18 = 18

3x = 18+18

3x=36     / :3

x= 12

 

b)

1/2 y +6 = y-4     / * 2

y+12=2y - 8

y - 2y = -8 -12

 -y = -20    /(-1)

  y= 20

 c)

 2*(x+3)+5*(x+2)=2

 2x + 6 + 5x +10 = 2

 7x= 2-16

 7x = -14     / :7

  x = -2

 

d)

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

6x-12 = 5+4x +12

6x-4x = 17 +12

2x = 29

x=14,5

 

e)2*(x-4)-3(x-3)=4

2x-8-3x+9 = 4

-x = 4 -1

-x = 3   / (-1)

x= -3