What is a deduction? Give a specific example not mentioned in the lesson that fits the category of a deduction. If you need to research to find an example, cite any sources used. Use complete sentences.

The expression has two variables x and y.

Step-by-step explanation:

What is a variable?

A variable is a letter, for instance or , that represents an unknown number.

Given the expression

The given expression has three terms which are x, 4y, and -9.

Here:

As we already know that a variable is a letter, for instance x or y, that represents an unknown number. In other words, the values of x, or y are unknown to us.

Thus, the expression has two variables x and y.