Question

If x + 5 = 9, then x = ?

• A. 4
• B. 5
• C. 9
• D. 14
• E. 45

Hint:

For simple equations like this, you can often solve it by inspection: "What number plus 5 equals 9?". The answer is 4. This mental check is very fast and efficient.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
This is a one-step linear equation. We need to find the value of the variable \(x\) by isolating it on one side of the equation.
Step 2: Key Formula or Approach:
To isolate \(x\), we perform the inverse operation of the one applied to it. Since 5 is added to \(x\), we will subtract 5 from both sides of the equation.
Step 3: Detailed Explanation:
The given equation is:
\[ x + 5 = 9 \]
Subtract 5 from both sides:
\[ x + 5 - 5 = 9 - 5 \]
\[ x = 4 \]
Step 4: Final Answer:
The value of \(x\) is 4, which corresponds to option (A).