Please, help me with this. I have no idea how to solve it
In what points are the tangent to the ellipse parallel to the line y = x?
why are the coefficients written that way?
why not just ?
in any case, find implicitly and set it equal to 1.
solve for x in terms of y or y in terms of x (whichever is easier), and sub the result back into the original equation to solve for the that chosen variable.