What do you call a mathematical sentence that contains an equals sign?

What do you call a mathematical sentence that contains an equals sign?

• A. Expression
• B. Equation
• C. Identity
• D. Proposition

Answer: (B)

An equation is a mathematical sentence that uses an equals sign to say two expressions are equal. It can be true or false, and it often involves numbers, variables, or both. For example, 3 + 4 = 7 is an equation because it claims the left side equals the right side. If an equation is true for every possible value of the variable, it’s called an identity, like x + x = 2x, which always holds. An expression, by contrast, is just a mathematical phrase like 3 + 4 or 2x—there’s no equals sign making a claim. A proposition is a general statement that can be true or false, not necessarily in the form of an equation.

An equation is a mathematical sentence that uses an equals sign to say two expressions are equal. It can be true or false, and it often involves numbers, variables, or both. For example, 3 + 4 = 7 is an equation because it claims the left side equals the right side. If an equation is true for every possible value of the variable, it’s called an identity, like x + x = 2x, which always holds. An expression, by contrast, is just a mathematical phrase like 3 + 4 or 2x—there’s no equals sign making a claim. A proposition is a general statement that can be true or false, not necessarily in the form of an equation.