@@ -396,3+396,7 @@ e.g. ${\left(dy^2 \over d^2 x\right)}^3$: order 2, degree 3
### Verifying solutions
Start with $y=\dots$, and differentiate. Substitute into original equation.
### Verifying solutions
Start with $y=\dots$, and differentiate. Substitute into original equation.
+
+### Function of the dependent variable
+
+If ${dy \over dx}=g(y)$, then ${dx \over dy} = 1 \div {dy \over dx} = {1 \over g(y)}$. Integrate both sides to solve equation. Only add $c$ on one side. Express $e^c$ as $A$.