Given points are
.
Slope of the line 
(Substitute
)
(Product of two same signs is positive)
(Subtract:
)
(Add:
)
(Divide:
)
Substitute slope and coordinates of either point in point-slope form line equation.
\Point slope form line equation is
where m = slope of the line. \ \
(Substitute
)
(Product of two same signs is positive)
The point-slope form line equation is
.