Consider the following.

$f(x,y)=3x-9y$

$($a$)$ Find $f(4,3)$ and $f(4\mathrm{.}1,3\mathrm{.}05)$ and calculate $z,$

$f(4,3)=$

$f(4\mathrm{.}1,3\mathrm{.}05)=$

$z=$

$$

$($b$)$ Use the total differential $dz$ to approximate $z.$

$dz=$

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Perdilf

$3.[-/4$ Points$]$

LARCALC$1213\mathrm{.}4\mathrm{.}012.\frac{0}{100}$ Sub$$

Consider the following.

$f(x,y)=\frac{y}{x}$

$($a$)$ Find $f(36,18)$ and $f(36\mathrm{.}5,18\mathrm{.}25)$ and calculate $z.$

$f(36,18)=$

$f(36\mathrm{.}5,18\mathrm{.}25)=$

$z=$

$($b$)$ Use the total differential $dz$ to approximate $z.$

$dz=$

$$

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$$