1. The problem statement, all variables and given/known data The equation of tangent is given t:2x+3y-2=0 and the equation of elipse E:x^2+4y^2=K Find "a" and "b" and the coordinates of touching point D. 2. Relevant equations equation of elipse: [tex]b^2x^2+a^2y^2=a^2b^2[/tex] equation for touching: [tex]a^2k^2+b^2=n^2[/tex] equation for K (if it is circular) : [tex]x^2+y^2=a^2[/tex] 3. The attempt at a solution Actually, I don't know what is K? Is it the equation of circular? Thanks.