Determine the slope of the normal line to the curve x2+xy+y2=7x^2 + xy + y^2 = 7x2+xy+y2=7 at the point (1,2)(1, 2)(1,2).
4/54/54/5
−5/4-5/4−5/4
5/45/45/4
−4/5-4/5−4/5