Question

Solve ax−12=9.(1 point) Responses x=3a x equals Start Fraction 3 over a End Fraction x=−3a x equals negative Start Fraction 3 over a End Fraction x=21a x equals Start Fraction 21 over a End Fraction x=−21a

Answer 1

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

1. Add 12 to both sides of the equation:
\[
ax - 12 + 12 = 9 + 12
\]
This simplifies to:
\[
ax = 21
\]

2. To isolate \( x \), divide both sides by \( a \):
\[
x = \frac{21}{a}
\]

So the solution is:
\[
x = \frac{21}{a}
\]

Thus, the correct response is \( x = \frac{21}{a} \).