To find:
Which of the following options is an equation.
Solution:
A mathematics or algebraic statement which represents that the values of two mathematical expressions are equal, is called an equation.
In option A,
[tex]5-4=9[/tex]
[tex]1\neq 9[/tex]
LHS≠RHS. So, it is not an equation.
In option B and C,
[tex]5+4=9[/tex]
[tex]9=9[/tex]
LHS=RHS. Both are equations.
In option D,
[tex]5+4-9[/tex]
This is an expression, not an equations.
Therefore, the correct options are B and C.
