The process we will follow to find the solution will be to first find the slope between the two given points, then apply a condition to find a perpendicular slope, and finally, we will find the equation of the perpendicular bisector line.
Step 1. Find the slope between the points R and S.
The points R and S are as follows:

We will label these points as follows:

And we need to find the slope "m" using the formula:

Substituting our values and solving the operations:

The slope between R and S is m=-1/6
Step 2. We need to find a line that is the perpendicular bisector of the segment R to S. We will call the slope of this perpendicular line

And use the following condition for the slopes of two perpendicular lines:

From this it follows that:

Where m is the slope we found in step 1:

Solving this division we find the slope of the perpendicular line:

Step 3. We have the slope of the perpendicular line, but, to be a perpendicular bisector, this perpendicular line needs to pass through the midpoint between R and S.
Calculate the midpoint between R and S using the following formula:

Substituting the values for x1, x2, y1, and y2 that had in step 1:

solving the operations:


The midpoint is at (2, 2.5).
Step 4. At this point we know the slope of the perpendicular bisector line:

And we also know that it has to pass through the midpoint:

The next step is to label the coordinates of the midpoint for reference:

And use the point-slope equation:

Substituting in this equation the known values:

And to have this equation in standard form we need to solve for y:

We can simplify by using the distributive property on the right-hand side of the equation:

The equation of the perpendicular bisector line in standard form is:

Answer:
