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Write the Appropriate Rotation Formulas So That in a Rotated 6x24xy+3y28x+8y=06 x ^ { 2 } - 4 x y + 3 y ^ { 2 } - 8 x + 8 y = 0

Question 135

Multiple Choice

Write the appropriate rotation formulas so that in a rotated system the equation has no x'y'-term.
- 6x24xy+3y28x+8y=06 x ^ { 2 } - 4 x y + 3 y ^ { 2 } - 8 x + 8 y = 0


A) x=5(x2y5) ;y=5(2x+y5) x = \sqrt { 5 } \left( \frac { x ^ { \prime } - 2 y ^ { \prime } } { 5 } \right) ; y = \sqrt { 5 } \left( \frac { 2 x ^ { \prime } + y ^ { \prime } } { 5 } \right)
B) x=5(2xy5) ;y=5(x+2y5) x = \sqrt { 5 } \left( \frac { 2 x ^ { \prime } - y ^ { \prime } } { 5 } \right) ; y = \sqrt { 5 } \left( \frac { x ^ { \prime } + 2 y ^ { \prime } } { 5 } \right)
C) x=35x45y;y=45x+35yx = \frac { 3 } { 5 } x ^ { \prime } - \frac { 4 } { 5 } y ^ { \prime } ; y = \frac { 4 } { 5 } x ^ { \prime } + \frac { 3 } { 5 } y ^ { \prime }
D) x=725x2425y;y=2425x+725yx = \frac { 7 } { 25 } x ^ { \prime } - \frac { 24 } { 25 } y ^ { \prime } ; y = \frac { 24 } { 25 } x ^ { \prime } + \frac { 7 } { 25 } y ^ { \prime }

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