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Part $1$

Assuming that the equation below defines y as a differentiable function of$$ x$,$ find the value of

dy divided by dxdy$/$dx

at the given point.

$4$ x squared plus xy plus $3$ y squared minus $21$ equals $04$x$2+$xy$+3$y$221=0,$

left parenthesis $2$ comma $1$ right parenthesis