If x - 4 = 5, what is the value of x?

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.