Answer:
B
Step-by-step explanation:
If you were to graph this, the four points line up with the linear equation.
just multiply each x input by 3 and add 9
The distance formula is , where and are the points.
Substitute in the points.
Subtract.
Solve the exponents.
Add.
Now, we can simplify this square root just a little bit. has a square factor of .
The square root of equals .