WholeLottaLove wrote:
Ok, so I get that Abs. value cannot be negative...distance cannot have a negative value.
We are trying to solve for x-2y, so naturally we are trying to determine x-2y. So,
If x=2y then the value of x-2y = 2y-2y = 0
OR
If x=-2y (the absolute value of 2y) then the value of x-2y = -2y-2y = -4y, correct?
I guess what throws me off is when you write
When x\leq{0} then |x|=-x. What you're saying is that, for example, |-4| = -(-4) or |-4| = 4. What is the point of writing |-4| = -(-4)
I'm sorry for being such a dolt. Sometimes, concepts that I know are very simple are extremely difficult to understand.
We are trying to solve for x-2y, so naturally we are trying to determine x-2y. So,
If x=2y then the value of x-2y = 2y-2y = 0
OR
If x=-2y (the absolute value of 2y) then the value of x-2y = -2y-2y = -4y, correct?
I guess what throws me off is when you write
When x\leq{0} then |x|=-x. What you're saying is that, for example, |-4| = -(-4) or |-4| = 4. What is the point of writing |-4| = -(-4)
I'm sorry for being such a dolt. Sometimes, concepts that I know are very simple are extremely difficult to understand.
Yes, that's correct: if x=2y, then x-2y=0 and if x=-2y, then x-2y=-4y.
As for the red part: it's just an example of the statement that if x\leq{0} then |x|=-x.