Question

Which of the following is a letter or symbol that represents a number or numbers?

• A. Coefficient
• B. Equation
• C. Expression
• D. Variable

Answer 1

The correct option is D Variable

$\to$ Variables are the letters like $a,b,$ and $c,$ or symbols like $\alpha ,\beta$ and $\gamma$ that could be used to represent the different numerical values in any expression as per the given conditions.
$\to$ Expression is a combination of variables, constants, and arithmetic operations.
$\to$ Equation is the word related to the equal sign $“=”$. If an expression is equal to zero or if one expression is equal to another expression, then it is known as an equation.
$\Rightarrow$ Coefficient is the number multiplied with the variables in an expression, or in an equation.

Consider the following expression:
$2x^2+3y+1=4y^3+2xy+28$
Here,

• $X$ and $y$ are the variables.
• $2,3,4,$ and $2$ multiplied with the variables will be considered as coefficients.
• Both $“2x^2+3y+1”$ and $“4y^3+2xy+28”$ are expressions.
• The entire expression would be called an equation.