Question

Which of the rolling equations have exactly one solutions ?

ps: (click the picture to see answer choices)

Answer 1

All have exactly one solution

Explanation:

a) -13x + 12 = 13x - 13

+13x +13x

-------------------------------

12 = 26x - 13

+13 +13

-------------------

25 = 26x

----- ------

26 26

25/26 = x

b) 12x + 12 = 13x - 12

-12x -12x

-----------------------

12 = x - 12

+12 +12

-----------------

24 = x

c) 12x + 12 = 13x + 12

-12x -12x

-----------------------------

12 = x + 12

0 = x

d) -13x + 12 = 13x + 13

+13x +13x

-----------------------------

12 = 26x + 13

-13 -13

-----------------------

-1 = 26x

--- -----

26 26

-1/26 = x