Question

2. Rozwiąż równanie.
a) 3x-9 = x+17
b) 25+ 10x=9x+3
c) 12x-9 = 13x+4
d) 4x-17 = x-20
e) -10x + 3 = 5x + 15
f) -5x + 22 = -8 + 21x​

Answer 1

Verified answer

a) 3x-9 = x+17

3x - x = 17 + 9

2x = 26          /:2

x = 13

b) 25+ 10x=9x+3

10x - 9x = 3 - 25

x = -22

c) 12x-9 = 13x+4

12x - 13x = 4 + 9

-x = 13

x = -13

d) 4x-17 = x-20

4x - x = -20 + 17

3x = -3        /:3

x = -1

e) -10x + 3 = 5x + 15

-10x - 5x = 15 - 3

-15x = 12            /:(-15)

x = - [tex]\frac{12}{15}[/tex]

x =  -  [tex]\frac{4}{5}[/tex]

f) -5x + 22 = -8 + 21x​

-5x - 21x = -8 - 22

-26x = -30     /:(-26)

x =  [tex]\frac{30}{26}[/tex]

x = [tex]\frac{15}{13}[/tex]

x = [tex]1\frac{2}{13}[/tex]

Answer 2

a) 3x-x=17+9

2x=26

x=13

b) 10x-9x=3-25

x=-22

c) 12x-13x=4+9

-x=13

x=-13

d) 4x-x=-20+17

3x=-3

x=-1

e) -10x-5x=15-3

-15x=12

x=-12/15=-4/5

f) -5x-21x=-8-22

-26x=-30

x=30/26=15/13= 1 2/13