How do we "check" our answers for math problems?
When working out math equations, we are often attempting to find a value that will "plug in" to the variables of that equation.
When obtaining a solution, it is always best to take that solution (or solutions) and substitute them back into the variable of the equation. Doing this will allow you to see whether or not your work is correct.
For example, if I have a math equation like 4x+10=34 and I obtain an answer of x=6, I could plug this answer back into the x in the original equation. Doing so will give me an answer of 4(6)+10 = 24+10 = 34. This answer is correct.