Final answer:
Out of the given phrases, B: b=9 and C: 7+19=26 are equations because they include an equals sign that equates two expressions.
Step-by-step explanation:
The student asks which of the following phrases are equations. An equation is a mathematical statement that asserts the equality of two expressions by using an equals sign (=). Therefore, an equation will always have an equals sign that equates two expressions. Given the choices:
- A: 4x3 (This is not an equation, it is an expression)
- B: b=9 (This is an equation, as it shows that b equals 9)
- C: 7+19=26 (This is an equation, it states that 7 plus 19 equals 26)
- D: a+9>72 (This is an inequality, not an equation)
- E: x + y - 8/3 (This is an expression also, not an equation)
Based on the definition, the phrases that are equations are B: b=9 and C: 7+19=26.