Algebra Practice Test 2026 – The Complete Guide to Mastering Your Exam Success!

To find the value of x in the equation \(x - 4 = 5\), we need to isolate x. This can be accomplished by adding 4 to both sides of the equation.

Starting with the original equation:

\[

x - 4 = 5

\]

Adding 4 to both sides results in:

\[

x - 4 + 4 = 5 + 4

\]

This simplifies to:

\[

x = 9

\]

Thus, the correct value of x is 9. This clearly indicates that option C is accurate, as it correctly identifies the solution of the equation. Other choices do not satisfy the equation when substituted back into the original statement.