1. The problem statement, all variables and given/known data The figure shows a lamp located three units to the right of the y-axis and a show created by the elliptical region x2+4y2[tex]\leq[/tex]5. If the point (-5,0) is on the edge of the shadow, how far above the x-axis is the lamp located? 2. Relevant equations Implicit Differentiation has to fit in here, since the chapter is on Implicit Differentiation, just not sure how. 3. The attempt at a solution I figure the tangent line has to be at (-1,1) to be able to hit the lamp three units to the right...but I really just am not sure how to really start this problem...very confusing, can someone give me a starting point? Thank you very much for any help.