The general equation or standard equation of a straight line is given by

Where

and

are any constants and also either

or

.

Putting

in the above standard equation of a line, we have

This shows that the line is passing through the point

.

Now similarly, by putting

in the same equation of straight line, we have

This shows that the line is passing through the point

.

Now equation of straight line passing through two points

and

is

This is equation of line in two-point form transformed from its general form or standard form. It is noted that the transformation of equation of line from its general or standard form for to point slope form and two points form is same.

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