Which of these is an equation rather than an expression?

Question

Accepted Answer

C. 2(x + 3) = 10

1. An equation must contain two expressions joined by an equal sign.
2. 2(x + 3) = 10 has an equal sign linking 2(x + 3) to 10, so it is an equation.
3. The other three choices contain no equal sign at all, so each of them is only an expression.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.2 Use the Language of Algebra_

Answer

4(y - 1) + 1

Answer

x divided by 25

Answer

3(x + 2) + 4