Question

Zad. 1

a) - 3x = 2x - 10

b) 2x - 2 =7 - x

c) 10 = 4 - 2x

d) -(2x - 1 ) = 4

e) 2(x + 1) = x

f) 2t - (3t + 1) =6

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

h) 3(y+6) - y =2 (y +9)

i) (x-7) - 2 (3x + 5 ) = 3

Answer 1

A)

-3x = 2x-10

-3x -2x = -10

 -5x = -10

 x =2

 

B) 2x - 2 = 7 -x

2x + x = 7+2

3x = 9

x = 3

 

C) 10 = 4-2x

-2x = 10 - 4

-2x = 6

x=-3

 

d) -(2x-1) = 4

-2x +1 = 4

-2x = 4-1

x = -3/2

 

e) 2(x+1) = x

2x +2 = x

x = -2

 

f) 2t - (3t+1) = 6

2t -3t - 1 = 6

-t = 6+1

t = -7

 

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

-4 - x = 6-2x

-x +2x = 6 + 4

x = 10

 

h) 3(y+6)-y = 2(y+9)

3y + 18 - y = 2y +18

2y-2y = 18-18

0=0

      w tym równaniu nie ma rozwiązania

 

i)  (x-7)-2 (3x +5) = 3

x-7 - 6x -10 = 3

-5x = 3+10 + 7

-5x = 20

x = -4