Which of these is NOT an algebraic expression?

Class 6AlgebraAlgebra

A $9 - 2 k$
B $5 m = 30$
C $\frac{y}{3} + 1$
D $8 a$

Step-by-Step Solution

5m = 30 carries an equals sign, so it is an equation, not an expression. The other three combine letters, numbers and operations with no '=' anywhere, which is exactly what makes them expressions.

Answer: B)

5 m = 30

Key idea: Evaluating an expression

To evaluate an expression, **substitute** a value for the variable and compute. If

x = 5

, then

2 x + 3

becomes

2 \times 5 + 3 = 10 + 3 = 13

. The same expression with

x = 0

gives

2 \times 0 + 3 = 3

. Practise substituting — it is the bridge between an algebraic expression and a real number.

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