## How do you separate variables in an equation?

Step 1 Separate the variables by moving all the y terms to one side of the equation and all the x terms to the other side:

- Multiply both sides by dx:dy = (1/y) dx. Multiply both sides by y: y dy = dx.
- Put the integral sign in front:∫ y dy = ∫ dx. Integrate each side: (y2)/2 = x + C.
- Multiply both sides by 2: y2 = 2(x + C)

## What is separation equation?

In mathematics, separation of variables (also known as the Fourier method) is any of several methods for solving ordinary and partial differential equations, in which algebra allows one to rewrite an equation so that each of two variables occurs on a different side of the equation.

**What does the diffusion equation model?**

The diffusion equation is a parabolic partial differential equation. In physics, it describes the macroscopic behavior of many micro-particles in Brownian motion, resulting from the random movements and collisions of the particles (see Fick’s laws of diffusion).

**Is heat equation a PDE?**

In mathematics and physics, the heat equation is a certain partial differential equation. The theory of the heat equation was first developed by Joseph Fourier in 1822 for the purpose of modeling how a quantity such as heat diffuses through a given region.

### How do you isolate a variable in an algebraic equation?

The basic technique to isolate a variable is to “do something to both sides” of the equation, such as add, subtract, multiply, or divide both sides of the equation by the same number. By repeating this process, we can get the variable isolated on one side of the equation.

### What are variables in maths?

A variable is a quantity that may change within the context of a mathematical problem or experiment. The letters x, y, and z are common generic symbols used for variables.

**When can’t you use separation of variables?**

Short answer: For equations that have constant coefficient, live in a nice domain, with some appropriate boundary condition, we can solve it by separation of variables. If we change one of above three conditions, then most of the time we can’t solve it by separation of variables.

**Why We Use separation of variables?**

By using separation of variables we were able to reduce our linear homogeneous partial differential equation with linear homogeneous boundary conditions down to an ordinary differential equation for one of the functions in our product solution (1) , G(t) in this case, and a boundary value problem that we can solve for …

#### How do you use the diffusion equation?

Equation (7.2) can be obtained easily from the last equation when combined with the phenomenological Fick’s first law, which assumes that the flux of the diffusing material in any part of the system is proportional to the local density gradient: Γ = −D∇u(r,t).