Question

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Part 1
Solve and check.
3xplus9equals12

Answer 1

To solve the equation \(3x + 9 = 12\), follow these steps:

1. **Subtract 9 from both sides** to isolate the term with \(x\):

\[
3x + 9 - 9 = 12 - 9
\]
\[
3x = 3
\]

2. **Divide both sides by 3** to solve for \(x\):

\[
\frac{3x}{3} = \frac{3}{3}
\]
\[
x = 1
\]

Now, let's check the solution by substituting \(x = 1\) back into the original equation:

\[
3(1) + 9 = 12
\]

Calculating gives:

\[
3 + 9 = 12
\]

Since both sides are equal, the solution is verified.

Thus, the solution to the equation \(3x + 9 = 12\) is:

\[
\boxed{1}
\]