Probability
Full Member
- Joined
- Jan 26, 2012
- Messages
- 425
I have worked on this problem most of the day, I really wanted to solve it but am struggling to see what I am missing!
I have
2b = a + 7
3a = 2b - 1
I wanted to find "a" first but am unable.
Find b
a = 2b - 7
3(2b - 7) - 1 = 2b
6b - 21 - 1 = 2b
6b - 2b = 22
4b = 22
4b / 4 = 22 / 4
b = 5.5
Now I know that b = 5 and I now that a = 3, but unless I mix up the arithmetic and get the sign conventions deliberately wrong I just can't get anywhere near the right values?
I have
2b = a + 7
3a = 2b - 1
I wanted to find "a" first but am unable.
Find b
a = 2b - 7
3(2b - 7) - 1 = 2b
6b - 21 - 1 = 2b
6b - 2b = 22
4b = 22
4b / 4 = 22 / 4
b = 5.5
Now I know that b = 5 and I now that a = 3, but unless I mix up the arithmetic and get the sign conventions deliberately wrong I just can't get anywhere near the right values?