How do we find the locus point.

It's locust like the bug (those are gross)
Locus is the term used in a specific geometrical way to describe the points that satisfies a condition where ever it is along a circle, or a line.

I know, what does that all mean?

To put it into easier terms it means that you will be finding a point along line or a point that represents a general circle. Here are a few Key terms you will be using.

"Equidistant": This means that the point or spot you will plot, will be equally distributed between a line. Meaning, it;s basically the center of a line that cuts it into two equal halves.

"Two Fixed Points: A line through the middle of a point, a perpendicular bisector.

one Line: Two parallel lines on opposite sides of the original line

One Point: This forms a circle. (Watch out for it)

two intersecting lines: Two lines half way between the two original lines. .

Basically, Locus is all those terms I just spat at you up there. There are times when you will need to find the specific locus the problem is talking about. For instance, if the problem says that the original point is the origin (0,0) and that it's points must be 3 units away, you plot 3 units away from the X and Y axis. It will give you a circle, and that it your locus. They get easier as you continue. One problem is when they ask you to locate the point that satisfies the condition,.