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Invariant line- Maths. HELP NEEDED URGENTLY.

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kitty:
can somebody pls pls help? i dont know how 2 find the invariant line for a shear/stretch in transformation in maths. (stretch mainly). EXAM IS 2MORO!!!! pls help? ???

X Abdulrahman X:
to find the invariant line, u take 1 point from a triangle, then another point but must be the one thats stretched, eg A and A2

A= (5.6)  A2=(5.12)
==(x,y)

X is invarient because it has not changed.


If it says multiply/stretch/shear triangle ABC for example by a number, and invarient line is Y, u do, for example the number is 3.

A=(5,  Y=(6x3)   ---   == A=(5,18), and u plot that point by A3 or w/e.

kitty:

--- Quote from: abdulrahman101 on May 12, 2009, 05:59:00 pm ---to find the invariant line, u take 1 point from a triangle, then another point but must be the one thats stretched, eg A and A2

A= (5.6)  A2=(5.12)
==(x,y)

X is invarient because it has not changed.


--- End quote ---

thanx  :-\. but what if there are no points that lie on the same line? i got such a question once and the invariant line was diagonal. is there a formula of some kind that i can use? ???

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