A curve has the equation x2+3xy+2x+y2=7x^2 + 3xy + 2x + y^2 = 7x2+3xy+2x+y2=7:
Find an expression for dydx\displaystyle \frac{dy}{dx}dxdy
Find an equation for the tangent to the curve at the point P(1,1)P(1, 1)P(1,1)