Question

Which of the following is/are an equation?

• A. $x=y$
• B. $x=0$
• C. $y=0$
• D. None of the above

Answer 1

Answer: (A), (B), (C)

The correct options are
A $x=y$
B $x=0$
C $y=0$

An equation is a mathematical statement that two things are equal. It consists of two expressions, one on each side of an 'equals' sign. For example $x=y$ is an equation where two expressions $x$ and $y$ are equal.

Whereas $f\left(x\right)=x$ is a function with variable $x$ and hence $f\left(x\right)=x$ is not an equation.