Given point is   and slope(m) = .

Because you know the slope and a point on the line,

Use point - slope form to write an equation of the line.

Let =  and slope(m) = .

            (Substitute 2 for ,4 for and m = )

Rewrite in slope - intercept form.

                       (Product of two same signs is positive)

            (Apply distributive property: )

               (Multiply: )

                    (Divide: )

        (Add 2 to each side)

             (Apply additive inverse property: )

                   (Apply additive identity property: )

                         (Add:  )

The equation of the line is  .