$-2.5xy+3.8xy-7.2xy+0.5xy-1.12xy-8.1xy$
$\lim_{x\to\infty}\left(\frac{x+1}{x^3+x}\right)$
$0.25x^2-0.3xy+0.09y^2$
$-220+-350$
$-4203+1115-935$
$2x^2-4x-y+4=0$
$\frac{dy}{dx}=-1.5+0.03y\left(x\right)$
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