A=(r+k/3)f solve for r

R = (K/3) + (A/F)

Step-by-step explanation:

The goal is to isolate the r on one side.

The first step is to distribute the f on the right side of the equation.

a=rf+kr/3

Then, we should subtract rf from both sides

a-rf=kf/3

Next we need to subtract a from both sides

-rf=kf/3-a

Lastly, we should divide both sides by -f

r=-k/3+a/f

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.