- #1
boarding4lif3
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Homework Statement
A lamp is located three units to the right of the y-axis and a shadow is created by the elliptical region x^2 + 4y^2 = 5. If the point (-5,0) is on the edge of the shadow, how far above the x-axis is the lamp located?
2. The attempt at a solution
Ive calculated the derivative with respect to X to be -x/4y = y'. But when i try to find the slope, I am stuck with an undefined when i try to use the point (-5,0)
Any help would be appriciated. Thanks.