Find the slope of the tangent line to the curve

(3x+3y−27)^(1/2)+(2xy−39)^(1/2)=8

at the point (8,4).

1 answer

√(3x+3y-27) + √(2xy-39) = 8

(3+3y')/2√(3x+3y-27) + (2y + 2xy')/2√(2xy-39) = 0

At (8,4)

(3+3y')/2√9 + (8+16y')/2√25 = 0

(1+y')/2 + (4+8y')/5 = 0

5(1+y') + 2(4+8y') = 0

5 + 5y' + 8 + 16y' = 0
21y' = -13
y' = -13/21
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