Question

Check whether $n=4$ or $n=5$ is the solution to the equation $2n=10$.

Answer 1

Solution must hold the equation true.
So, let’s check by substituting the value of $n$ in the equation.
$2n=10$
Case 1: Substituting $n=4$ in the equation, we get,
LHS: $2\left(4\right)=8$
RHS: $10$
So, LHS ≠ RHS. Therefore, $n=4$ is not a solution to the equation.
Case 2: Substituting $n=5$ in the equation, we get,
LHS: $2\left(5\right)=10$
RHS: $10$
So, LHS = RHS.
Therefore, $n=5$ is a solution to the equation.