Probability
Full Member
- Joined
- Jan 26, 2012
- Messages
- 425
OK tried this all night to solve and not getting anywhere.
- 1/3x + 13/3 = - 2x - 4
First method
12x/3 = - 2x - 4
4x = - 2x - 4
2x = - 4 (NO)
Second method
-1/3x + 13/3 = - 2x - 4
multiply through by 3
-3x + 13 = - 6x - 12
- 9x = 1 (NO)
Third method
-1/3x + 13/3 = -2x -4
-1x + 13 = -6x - 12
-7x = 1 (NO)
I should get x = -5
OK I think I have solved it?
- 1/3x + 13/3 = - 2x - 4
- x + 13 = - 6x - 12
x - x + 13 = - 6x + x - 12
13 = - 5x - 12
13 + 12 = - 5x - 12 + 12
25 = - 5x
x = - 5
- 1/3x + 13/3 = - 2x - 4
First method
12x/3 = - 2x - 4
4x = - 2x - 4
2x = - 4 (NO)
Second method
-1/3x + 13/3 = - 2x - 4
multiply through by 3
-3x + 13 = - 6x - 12
- 9x = 1 (NO)
Third method
-1/3x + 13/3 = -2x -4
-1x + 13 = -6x - 12
-7x = 1 (NO)
I should get x = -5
OK I think I have solved it?
- 1/3x + 13/3 = - 2x - 4
- x + 13 = - 6x - 12
x - x + 13 = - 6x + x - 12
13 = - 5x - 12
13 + 12 = - 5x - 12 + 12
25 = - 5x
x = - 5
Last edited: