Variables Separable | MATHalino reviewer about Variables Separable

Problem 07
$y' = x \exp (y - x^2)$, when $x = 0$, $y = 0$.

Solution 07

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$y' = x \exp (y - x^2)$

$\dfrac{dy}{dx} = x e^{y - x^2}$

Problem 05
$2y \, dx = 3x \, dy$, when $x = -2$, $y = 1$.

Solution 05
From Solution 04,
$\dfrac{x^2}{y^3} = c$

Problem 03
$xy \, y' = 1 + y^2$, when $x = 2$, $y = 3$.

Solution 03
$xy \, y' = 1 + y^2$

$xy \dfrac{dy}{dx} = 1 + y^2$

Problem 02
$2xy \, y' = 1 + y^2$, when $x = 2$, $y = 3$.

Solution 2
$2xy \, y' = 1 + y^2$

$2xy \dfrac{dy}{dx} = 1 + y^2$

Problem 04
$2y \, dx = 3x \, dy$, when $x = 2$, $y = 1$.

Solution 04
$2y \, dx = 3x \, dy$

$\dfrac{2y \, dx}{xy} = \dfrac{3x \, dy}{xy}$

Problem 01
$\dfrac{dr}{dt} = -4rt$, when $t = 0$, $r = r_o$

Solution 01
$\dfrac{dr}{dt} = -4rt$

$\dfrac{dr}{r} = -4t\,dt$