Do 9 Principal Axes and Conic Section of Quadratic Equation
Do 9
 Principal Axes and Conic Section of Quadratic Equation  9 x^2 + 6 xy + y^2 =10  Solving ODEs by Matrix Method: Find x(t) and y(t):  x\' = x + 4y x(0) = 1  y\' = x + y y(0) = 0Solution
9x2 + 6xy + y2 = 10
( 3x )2 + 2( 3x )( y ) + ( y )2 = 10
( 3x + y )2 = 10
( 3x + y ) = 10 or ( 3x + y ) = - 10
3x + y - 10 = 0 or 3x + y + 10 = 0
Therefore , the above conic equation denotes pair of straight lines .

