Question: Animate the plot

Question 1:

Animate the plot of the graph x^2 + Bxy + 4y^2 = 2010 letting the parameter B range from -10 to 10 using frames 100. Determine when family of curves is 2 straight line.

Question 2: 

Animate the plot of the graph z^2 + c = x^2 + y^2 letting the parameter C range from -10 to 10 using frames. How can I graph and Describe what is happening

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