(a) Find with proof all real number solutions (x, y) of 10x^2 + 26xy −72x + 17y^2 −94y + 130 = 0.
(b) Find with proof all real number solutions (x, y) of x^4 −4x^3y + 6x^2y^2 + x^2 −4xy^3 + 2xy −4x +
y^4 + y^2 −4y + 4 = 0.