Algebra-1

The correct answer is B. An equation is a mathematical sentence showing two expressions are equal.

An equation is a statement that asserts the equality of two mathematical expressions. It consists of two sides, often separated by an equal sign (=), with expressions on both sides. The expressions can involve variables, constants, and mathematical operations such as addition, subtraction, multiplication, and division.

For example, the equation "2x + 5 = 13" states that the expression "2x + 5" is equal to the expression "13." In this equation, "x" is the variable, and finding its value that satisfies the equation is often the goal in s...