Question

Solve a x - 12 = 9.
A. x = - 21/a
B. x = - 3/a
C. x = 21/a
D. x = 3/a

Answer 1

are you positive this is correct

Answer 2

To solve the equation \( ax - 12 = 9 \), follow these steps:

1. **Add 12 to both sides**:
\[
ax - 12 + 12 = 9 + 12
\]
\[
ax = 21
\]

2. **Divide both sides by \( a \)**:
\[
x = \frac{21}{a}
\]

Thus, the correct answer is:
**C. \( x = \frac{21}{a} \)**.

Answer 3

Yes, let's double-check the solution step by step to ensure it's correct.

Given the equation:

\[
ax - 12 = 9
\]

1. **Add 12 to both sides**:
\[
ax = 9 + 12
\]
\[
ax = 21
\]

2. **Divide both sides by \( a \)** (assuming \( a \neq 0 \)):
\[
x = \frac{21}{a}
\]

So, the solution to the equation is indeed:

\[
x = \frac{21}{a}
\]

Conclusion: The answer is **C. \( x = \frac{21}{a} \)**.