Can you explane how to do C and D? I am unable to open a file so please don't make the explanation a file.

Implicit Differentiation from Graphs 1)The graph of the equation y4 = y2 - x2 is shown at the right. A) Verify that ay 2x dx d (y* ) = d(yz) 2y-43 dy -2x dx d (x 2 ) dx X dx -= 443-2y 43 dy = 24 dy - 2x dy + 2x 7( 24 - 4 43) 2x 4 43 - 24] = -2x dy' 2 X dx 24-443 B) Find the points (x, y) at which the graph has a horizontal tangent line. Give the equation of these lines. (01-1) and Co, 1 ) dy 2X dx y - y , = on ( x 4 x , ) 24- 4 43 0 2. 2X y - (- 1) = 0 ( x - 0 ) 2 4-443 X = 0 y - 1 = 0 ( x- 0 ) C) Find the y-values at which the graph has a vertical tangent line. dy 2 X 2x dx 24-4 43 24-4 43 0 D) While the graph exists at (0,0), the slope does not. Using ax ex g dy, explain why this is so. 2) The graph of the equation x2 + xy + yz = 7 is graphed at the right. A) Find two points where the curve crosses the x - axis