A curve has the equation 2x2−xy+3y+y2=102x^2 - xy + 3y + y^2 = 102x2−xy+3y+y2=10:
Find an expression for dydx\displaystyle \frac{dy}{dx}dxdy
Find an equation for the tangent to the curve at the point P(2,1)P(2, 1)P(2,1)