torrobinson
New member
- Joined
- Nov 13, 2006
- Messages
- 6
edit: whoops, move to "beginner algebra" please!
Ok. I just KNOW this will be another stupid mistake that I don't see now, and I'll feel like an idiot when I realize how simple it was. But:
1/x - 4/3x = 1/5
greatest common denominator is 15x, right?
15(1/x) - 5(4/3x) = 3x(1/5)
is
15/15x - 20/15x = 3x/15x
cross out the common denominator and:
15 - 20 = 3x
-5 = 3x
x= -5/3
------------
But when I graph to check this, I'm totally off..... yeah.... :S
edit: sorry if this is in the wrong forum-section. This is where I bookmarked the page earlier.... this question is probably considered beginner algebra. It was a small question on the start of an exam I had today, and when I talked to another classmate, we both got the same answer of -5/3
Ok. I just KNOW this will be another stupid mistake that I don't see now, and I'll feel like an idiot when I realize how simple it was. But:
1/x - 4/3x = 1/5
greatest common denominator is 15x, right?
15(1/x) - 5(4/3x) = 3x(1/5)
is
15/15x - 20/15x = 3x/15x
cross out the common denominator and:
15 - 20 = 3x
-5 = 3x
x= -5/3
------------
But when I graph to check this, I'm totally off..... yeah.... :S
edit: sorry if this is in the wrong forum-section. This is where I bookmarked the page earlier.... this question is probably considered beginner algebra. It was a small question on the start of an exam I had today, and when I talked to another classmate, we both got the same answer of -5/3