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Feb15-13, 09:27 AM
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Motion along a Slanting Line

Quote Quote by grajee View Post
Suppose, if you have a SLANTING line (45 degree) in between X & Y axis and if you rotate the coordinates by 45 degrees would not (or should not) the SLANTING line also move by 45 degree? If the SLANTING line does not (or should not) move then I agree the X axis is the same as the SLANTING line.
But why would that line move?

Typically, a line represented by a coordinate axis represents something physical. This could be the direction to Alpha Centuri, the direction of an inclined slope, the direction to Grandma's house... etc. It would be VERY strange if, just by rotating your graph paper, that physical direction also changes in space!