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Answer:

The expression [tex]x + 4y - 9[/tex] has two variables x and y.

Step-by-step explanation:

What is a variable?

A variable is a letter, for instance [tex]x[/tex] or [tex]y[/tex], that represents an unknown number.

Given the expression

[tex]x + 4y - 9[/tex]

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

Here:

  • The term 'x' is the unknown variable x.
  • The term '4y' has a coefficient (the number next to a variable y) of 4.
  • The term '-6' is a constant.

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 [tex]x + 4y - 9[/tex] has two variables x and y.

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