To solve the equation \(9 + x = -1\), follow these steps:

1. Subtract 9 from both sides to isolate \(x\):
   \[
   9 + x - 9 = -1 - 9
   \]

2. Simplify:
   \[
   x = -10
   \]

The solution is \(x = -10\). 

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Would you like to see a verification or further steps?  
Here are 5 related questions for practice:  

1. Solve: \(7 + y = -2\).  
2. Solve: \(x - 5 = 3\).  
3. What is the solution to \(12 + x = 0\)?  
4. Solve for \(x\): \(x + 4 = 1\).  
5. If \(a + b = 5\), what is \(b\) when \(a = -2\)?  

**Tip:** Always perform the same operation on both sides of an equation to maintain equality.

Learn how to solve the linear equation 9 + x = -1 with a clear step-by-step solution. This problem explores fundamental algebraic principles and uses the addition and subtraction properties of equality. Perfect for students in Grades 6-8.

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