Question Function Find the first partial derivative with respect to r Find the first partial derivative with respect to a ∂r∂l=a Simplify l=raFind the first partial derivative by treating the variable a as a constant and differentiating with respect to r ∂r∂l=∂r∂(ra)Use differentiation rule ∂x∂(cf(x))=c×∂x∂(f(x)) ∂r∂l=a×∂r∂(r)Use ∂x∂xn=nxn−1 to find derivative ∂r∂l=a×1Solution ∂r∂l=a Show Solution Solve the equation Solve for a Solve for l Solve for r a=rl Evaluate l=raSwap the sides of the equation ra=lDivide both sides rra=rlSolution a=rl Show Solution