Question

What is the value of $9-x$when $x=5$?

$\begin{array}{l}\text{A}.\text{1}\\ \text{B}.\text{4}\\ \text{C}.\text{14}\\ \text{D}.\text{45}\end{array}$

Short answer

The correct solution for this question is B ($\text{4}$).

Step-by-step solution

Step 1.  Apply the concept of putting the given value of x

In this, simply use the concept of putting the given value of x in the equation to get the correct answer.

Step 2.  Find the solution of the equation

Here,

$\text{9}-\text{x}=?$

simply put the value of x in the above equation

$\left(\text{put x}=\text{5}\right)$

$\text{9}-\text{5}=\text{4}$

Step 3.  Eliminating the options to get correct one

A. 1 It is the incorrect option because by taking $\text{1}$, the result is $9-5\ne 1$

B. 4 It is the correct option because by taking, the result is $\text{9}-\text{5}=\text{4}$which is absolutely correct.

C. 14 It is the incorrect option because by taking $\text{14}$, the result is $9-5\ne 14$

D. 45 It is the incorrect option because by taking $\text{45}$ , the result is $9-5\ne 45$