Find

f$$Subscript$$x

and

f$$Subscript$$y

for$$f$($x$,$

$$y$)$equals$=9$ left parenthesis $5$ x minus $6$ y plus $4$ right parenthesis cubed$9(5$x$6$y$+4)3.$

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Part $1$

f Subscript x Baseline left parenthesis x comma y right parenthesisfx$($x$,$y$)$equals$=$enter your response here

Part $2$

f Subscript y Baseline left parenthesis x comma y right parenthesisfy$($x$,$y$)$equals$=$enter your response here