Substitute the coordinates of the point into the equation of the line. If the result is true, then the point is on the line.
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A liar which is similar to you.
graph it
Draw a line joining a point and its image and find its midpoint. Repeat for another pair of point and its image. The line joining these midpoints is the line of reflection.
A straight line. Draw a straight line. Make a dot/point on that line. From a point on the line to the left of the dot , sweep an arc to a point on the line to the right of the dot. You will find it to be 180 degrees.
The equidistant point of a straight line is the middle. Measure the distance from one end to the other and half it.