# 1.11 Formulas and Literal Equations

**Formulas • Literal Equations • Subscripts • Solve for Symbol before Substituting Numerical Values**

An important application of equations is in the use of *formulas* that are found in geometry and nearly all fields of science and technology. *A* **formula** (or **literal equation**) *is an equation that expresses the relationship between two or more related quantities*. For example, Einstein’s famous formula $E\hspace{0.17em}=\hspace{0.17em}m{c}^{2}$ shows the equivalence of energy `E` to the mass `m` of an object and the speed of light `c`.

We can solve a formula for a particular symbol just as we solve any equation.

# NOTE

[That is, we isolate the required symbol by using algebraic operations on literal ...

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