Question

PLEASE HELP. Rotate the axes to eliminate the xy term in the equation. then write the equation in standard form...

a. x^2-4xy+y^2+9=0

and

b. 5x^2-2xy+5y^2-12=0

Answer 1

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

Answer 2

:(

Answer 3

take X=ax+by and Y=bx-ay
putting this in the first equation
(ax+by)^2-4(ax+by)(bx-ay)+(bx-ay)^2+9=0
this gives u an xy term with co-efficient a^2-b^2,so a^2=b^2
from 2nd equation
also u get a^2=b^2....so u can take any pair of a,b....

Answer 4

Question a and b are separate problems :/ thank you though