(a) Find f,(1, 4) and f,(1, 4). ,(1, 4) = (1, 4) =

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Chapter6: Topics In Analytic Geometry
Section6.6: Parametric Equations
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Let f(x, y) = 9 – x² + xy – 5y2.
(a) Find f.(1, 4) and f,(1, 4).
fx(1, 4)
f,(1, 4) =
(b) Interpret the numbers in part (a) as slopes.
f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 - x² + xy – 5y2 and the plane y
= 4 at the point (1, 4, –68). f,(1, 4) is the slope of the
tangent line to the curve of intersection of the surface z = 9 – x² + xy – 5y and the plane x = 1 at the point (1, 4, -68).
O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x + xy – 5y and the plane y = 1 at the point (1, 4, –68). f (1, 4) is the slope of the
tangent line to the curve of intersection of the surface z =
9 - x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, -68).
O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z =
9 – x2 + xy – 5y2 and the plane y = 0 at the point (1, 4, –-68). f(1, 4) is the slope of the
tangent line to the curve of intersection of the surface z =
9 – x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, -68).
O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z =
9
x2 + xy – 5y2 and the plane y = 4 at the point (1, 4, 0). f(1, 4) is the slope of the
tangent line to the curve of intersection of the surface z =
9 – x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, 0).
(c) Interpret the numbers in part (a) as rates of change.
O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 4. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value
of 0.
O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 4. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a
value of 1.
O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 1. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value
of 4.
O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of -39. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a
value of 2.
Transcribed Image Text:Let f(x, y) = 9 – x² + xy – 5y2. (a) Find f.(1, 4) and f,(1, 4). fx(1, 4) f,(1, 4) = (b) Interpret the numbers in part (a) as slopes. f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 - x² + xy – 5y2 and the plane y = 4 at the point (1, 4, –68). f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x² + xy – 5y and the plane x = 1 at the point (1, 4, -68). O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x + xy – 5y and the plane y = 1 at the point (1, 4, –68). f (1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 - x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, -68). O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x2 + xy – 5y2 and the plane y = 0 at the point (1, 4, –-68). f(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, -68). O f,(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 x2 + xy – 5y2 and the plane y = 4 at the point (1, 4, 0). f(1, 4) is the slope of the tangent line to the curve of intersection of the surface z = 9 – x2 + xy - 5y2 and the plane x = 1 at the point (1, 4, 0). (c) Interpret the numbers in part (a) as rates of change. O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 4. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value of 0. O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 4. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value of 1. O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of 1. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value of 4. O f,(1, 4) is the rate of change of f(x, y) with respect to x with y held fixed with a value of -39. f,(1, 4) is the rate of change of f(x, y) with respect to y with x held fixed with a value of 2.
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