1)the curve c has equation
13x² +13y² - 10xy = 52
find the dy/dx as a function of x and y, simplifying the answer
2) a curve has equation 7x² +48xy - 7y² +75 =0
a and b are 2 distinct points on the curve. at each of these points the gradient of the curve is equal to 2/11.
a) find the implicit differentiation to show that x + 2y = 0 at the points a and b
b) find the co-ordinates of the points a and b