What Are the 4 Types of Equations?

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The first step is to know the rules of equivalent equations: Addingor subtracting the same number or expression to both sides of an equation produces an equivalent equation. Multiplying or dividing both sides of an equation by the same non-zero number produces an equivalent equation.

How to number several equations with only one number?

How can I number several equations in a align environment using only one number? The numbering will appear next to the second equation. But it would be better if it appears between the lines of the two equations. In this case how to label this group of equations for later referring to?

Can you have more than one column of equations?

First of all, you probably don’t want the align environment if you have only one column of equations. In fact, your example is probably best with the cases environment. But to answer your question directly, used the aligned environment within equation – this way the outside environment gives the number: