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Find the equation of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2-y^2) at the point ( -3 , -1 )

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differentiate implicitly with respect to x and solve for dy/dx
sub in the point (-3,-1) to get the slope

now use the grade 9 way of finding the equation of a straight line

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