### Video Transcript

Which of the following is an equation? Is it A) three 𝑥 plus six equals negative three? Is it B) five 𝑥 plus five, C) 25 plus 11, or D) 𝑥 is greater than or equal to five?

An equation is a statement that the values of two mathematical expressions are equal. This is indicated by the equal sign. The only option that contains an equal sign is option A, three 𝑥 plus six equals negative three.

Therefore, option A must be an equation. Options B and C are expressions, and option D is an inequality. Therefore, the only option that is an equation is three 𝑥 plus six equals negative three.