Thus, we use equations that have the same form as above.

They can be modeled using equations of the same form.

This term may be found using the equation for t above.

They used very complex equations to arrive at that number.

Such models describe the current weather conditions, and how they change over time using equations.

Other properties, such as density, can also be calculated using equations of state.

We used the same equation to locate the least dangerous place.

Using well known mathematical equations, they created a computer simulation of the human visual system.

Let us use the equation to predict the future.

I have a feeling he's wrong in using partial differential equations only.